CN112737627A

CN112737627A - Radio frequency circuit, electronic device, signal processing method, and readable storage medium

Info

Publication number: CN112737627A
Application number: CN202011591151.0A
Authority: CN
Inventors: 盛雪锋
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-04-30
Anticipated expiration: 2040-12-29
Also published as: CN112737627B

Abstract

The application discloses a radio frequency circuit, electronic equipment, a signal processing method and a readable storage medium, and belongs to the technical field of communication. Wherein, radio frequency circuit includes: the antenna, the radio frequency transceiver, the filtering module, the antenna switch, the first low-noise amplification module and the second low-noise amplification module; the antenna is connected with a signal receiving end of the radio frequency transceiver through a first low-noise amplification module, an antenna switch, a filtering module and a second low-noise amplification module in sequence, and a control end of the first low-noise amplification module and a control end of the second low-noise amplification module are respectively connected with a first end of the radio frequency transceiver; the radio frequency transceiver controls one of the first low noise amplification module and the second low noise amplification module to be in a working state and controls the other one of the first low noise amplification module and the second low noise amplification module to be in a closed state according to the analysis condition of the received signal. The embodiment of the application can improve the receiving capability of the radio frequency circuit.

Description

Radio frequency circuit, electronic device, signal processing method, and readable storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a radio frequency circuit, an electronic device, a signal processing method, and a readable storage medium.

Background

With the development of communication technology, people have higher and higher requirements for radio frequency communication quality, and in the related art, the transmission performance of a terminal can be improved by improving the transmission power of a power amplifier and the like. When it is necessary to improve the rf receiving performance, the related art connects the antenna switch and the filter in the rf path to the rf transceiver through a Low Noise Amplifier (LNA) to improve the receiving sensitivity. However, after the low noise amplifier is added, the loss caused by the antenna switch and the filter in the radio frequency path cannot be overcome, so that it is difficult to improve the radio frequency receiving performance of the terminal.

Disclosure of Invention

An object of the embodiments of the present application is to provide a radio frequency circuit, an electronic device, a signal processing method, and a readable storage medium, which can improve a gain effect of a low noise amplifier to further improve a radio frequency receiving performance of the radio frequency circuit.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides a radio frequency circuit, including: the antenna, the radio frequency transceiver, the filtering module, the antenna switch, the first low-noise amplification module and the second low-noise amplification module;

the antenna is connected with a signal receiving end of the radio frequency transceiver through the first low-noise amplification module, the antenna switch, the filtering module and the second low-noise amplification module in sequence, and a control end of the first low-noise amplification module and a control end of the second low-noise amplification module are respectively connected with a first end of the radio frequency transceiver;

wherein, the radio frequency transceiver controls one of the first low noise amplification module and the second low noise amplification module to be in a working state and controls the other one of the first low noise amplification module and the second low noise amplification module to be in a closed state according to the analysis condition of the received signal

In a second aspect, an embodiment of the present application provides an electronic device, including the radio frequency circuit according to the first aspect.

In a third aspect, an embodiment of the present application provides a signal processing method, which is applied to the electronic device according to the second aspect, and the signal processing method includes:

performing first low-noise amplification processing on a radio-frequency signal received by an antenna by using a first low-noise amplifier, filtering the radio-frequency signal subjected to the first low-noise amplification processing, and performing first demodulation processing on the radio-frequency signal subjected to the filtering processing;

under the condition that the first demodulation processing does not meet the preset condition, response processing is carried out on the radio-frequency signal after the first demodulation processing;

and under the condition that the first demodulation processing meets the preset condition, closing the first low-noise amplifier, and performing second low-noise amplification processing on the radio-frequency signal after the filtering processing by adopting a second low-noise amplifier, wherein the first demodulation processing meets the preset condition and indicates that the demodulation fails.

In a fourth aspect, the present application provides an electronic device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method according to the third aspect.

In a fifth aspect, the present application provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the third aspect.

In a fifth aspect, embodiments of the present application provide a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the third aspect.

In the embodiment of the application, by additionally arranging the first low-noise amplification module at one end of the filtering module close to the antenna, and controls one of the first low noise amplification module and the second low noise amplification module to be in a working state according to the analysis condition of the radio frequency transceiver on the radio frequency signal received by the antenna, to amplify the radio frequency signal by the first low noise amplifying module before filtering, so as to increase the gain effect of the filter amplifier and cause the first low noise amplifier module to work in the saturation region due to the large external interference, so that the first low noise amplification module is turned off when the radio frequency transceiver is not convenient to analyze the radio frequency signal, and the radio frequency signal after filtering is amplified by a second low noise amplification module, the condition that the radio frequency signal is inconvenient to analyze is overcome, and therefore the receiving capacity of the radio frequency signal can be improved.

Drawings

Fig. 1 is a circuit diagram of a radio frequency circuit according to an embodiment of the present application;

fig. 2 is a circuit diagram of another rf circuit provided in an embodiment of the present application;

fig. 3 is a flowchart of a signal processing method according to an embodiment of the present application;

fig. 4 is a flowchart of another signal processing method provided in the embodiment of the present application;

fig. 5 is a block diagram of an electronic device according to an embodiment of the present disclosure;

fig. 6 is a block diagram of another electronic device provided in the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

In the related art: in order to avoid that the radio frequency circuit operates in an operating environment with high interference, the low noise amplifier operates in a saturated state, and thus the amplified received signal cannot be analyzed by the radio frequency transceiver, a low noise amplifier is often required to be disposed at the rear ends of the filtering module and the antenna switch (i.e., downstream along the transmission direction of the received signal), so as to amplify the received signal after being filtered by the filter in advance, that is, in the related art, the low noise amplifier is disposed at the rear ends of the filtering module and the antenna switch. However, the filtering module and the antenna switch are used for transmission and processing, inevitable loss is caused to the received signal, and the low-noise amplification module cannot compensate the loss by providing corresponding gain, so that the sensitivity of the received signal is reduced.

In the embodiment of the application, the low-noise amplification modules are respectively arranged at the front end and the rear end of the filtering module and the antenna switch, so that when the first low-noise amplification module at the front end of the filtering module and the antenna switch works, the received signals can be amplified in advance before the filtering module and the antenna switch cause loss to the received signals, a better gain effect is achieved, and the receiving performance of the radio frequency circuit can be improved.

The radio frequency circuit, the electronic device, the signal processing method, and the readable storage medium provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

Referring to fig. 1, a circuit diagram of a radio frequency circuit according to an embodiment of the present application is shown in fig. 1, where the radio frequency circuit includes: the antenna comprises an antenna 1, a radio frequency transceiver 2, a filtering module 3, an antenna switch 4, a first low noise amplification module 5 and a second low noise amplification module 6.

The antenna 1 is connected with a signal receiving end of the radio frequency transceiver 2 through a first low noise amplification module 5, an antenna switch 4, a filtering module 3 and a second low noise amplification module 6 in sequence, and a control end of the first low noise amplification module 5 and a control end of the second low noise amplification module 6 are respectively connected with a first end of the radio frequency transceiver 2;

the radio frequency transceiver 2 controls one of the first low noise amplification module 5 and the second low noise amplification module 6 to be in a working state and controls the other of the first low noise amplification module 5 and the second low noise amplification module 6 to be in a closed state according to the analysis condition of the received signal.

It should be noted that, under some operating environments, the first low noise amplification module 5 is not suitable, for example: the operating environment of the radio frequency circuit has great interference, so that the received signal amplified by the first low noise amplification module 5 cannot be accurately mediated by the radio frequency transceiver 2 under the condition that the first low noise amplification module 5 works in a saturated state. At this time, the radio frequency transceiver 2 switches the operating low noise amplifier to the second low noise amplification module 6 according to the analysis condition of the received signal, so that after the second low noise amplification module 6 performs filtering processing on the received signal by the filtering module 3, the received signal is amplified, so as to prevent the second low noise amplification module 6 from operating in a saturated state due to a large interference signal, thereby improving the reliability of the received signal.

In an alternative embodiment, the radio frequency transceiver 2 controls one of the first low noise amplification module 5 and the second low noise amplification module 6 to be in an operating state according to the analysis of the received signal, which can be understood as: the radio frequency transceiver 2 controls the first low noise amplification module 5 or the second low noise amplification module 6 to be in a working state respectively, obtains analysis conditions of received signals respectively, and compares the quality degrees of the analysis conditions in two different working states to select one low noise amplification module in the working state to be continuously in the working state when the radio frequency analysis condition is better.

In this way, the radio frequency transceiver 2 can select one of the first low noise amplification module 5 and the second low noise amplification module 6, the amplification processing effect of which is more matched with the current radio frequency operating environment, so as to control the selected one to be in a working state, thereby improving the amplification effect of the received signal.

In another alternative embodiment, the radio frequency transceiver 2 controls one of the first low noise amplification module 5 and the second low noise amplification module 6 to be in an operating state according to the analysis condition of the received signal, which can also be understood as: the radio frequency transceiver 2 can preferentially control the first low noise amplification module 5 to be in a working state and acquire the analysis condition of the received signal, and if the analysis of the received signal fails, the first low noise amplification module 5 is closed and the second low noise amplification module 6 is started; otherwise, the first low noise amplification module 5 is controlled to be kept in the working state.

It should be noted that, when the first low noise amplification block 5 or the second low noise amplification block 6 is in the off state, it can be understood that: the first low noise amplification block 5 or the second low noise amplification block 6 is short-circuited or in a short-circuited state.

In this embodiment, the first low noise amplification module 5 is preferentially adopted to amplify the received signal before filtering, and when the first low noise amplification module 5 may cause the radio frequency transceiver to be unable to mediate the received signal, the second low noise amplification module 6 is switched to be started. Compared with the previous embodiment, it is avoided that, in an operating environment where the first low noise amplification module 5 is suitable for, the following steps are performed: respectively controlling the first low-noise amplification module 5 or the second low-noise amplification module 6 to be in a working state, respectively acquiring the analysis conditions of the received signals, and then comparing the quality degrees of the analysis conditions in two different working states to select and start a complex process of a low-noise amplification module which is more favorable for the radio frequency analysis conditions.

As an alternative embodiment, as shown in fig. 2, the first low noise amplification block 5 includes: a first low noise amplifier 51 and a first bypass switch 52 connected in parallel to the first low noise amplifier 51;

the second low noise amplification block 6 includes: a second low noise amplifier 61 and a second bypass switch 62 connected in parallel to the second low noise amplifier 61;

the control end of the first low noise amplification module 5 is the control end of the first bypass switch 52, and the control end of the second low noise amplification module 6 is the control end of the second bypass switch 62;

when the first bypass switch 52 is in the on state, the first low noise amplification module 5 is in the off state; when the first bypass switch 52 is in the off state, the first low noise amplification module 5 is in the working state;

when the second bypass switch 62 is in the on state, the second low noise amplification module 6 is in the off state; when the second bypass switch 62 is in the off state, the second low noise amplification module 6 is in the operating state.

As shown in fig. 2, when the radio frequency transceiver controls the first bypass switch 52 to be closed, the branch where the first bypass switch 52 is located short-circuits the first low noise amplifier 51, thereby controlling the first low noise amplifier to be in an off state; accordingly, when the radio frequency transceiver controls the first bypass switch 52 to be turned off, the branch where the first bypass switch 52 is located is turned off, so that the first low noise amplifier 51 is not short-circuited, so that the received signal in the radio frequency path can only be transmitted from the first low noise amplifier 51, and thus the first low noise amplifier is controlled to be in the working state.

The process of adjusting the operating state of the second low noise amplifier 61 by controlling the open/close state of the second bypass switch 62 is the same as the process of adjusting the operating state of the first low noise amplifier 51 by controlling the open/close state of the first bypass switch 52, and is not described herein again.

It should be noted that, in an implementation, there may be a case where the operating bandwidth of one low noise amplifier is not enough to completely cover the operating frequency of the radio frequency circuit, and a plurality of low noise amplifiers respectively corresponding to different operating frequencies may be provided.

As an alternative implementation, as shown in fig. 2, the first low noise amplification module 5 includes at least two first low noise amplifiers 51 connected in series, and each first low noise amplifier 51 is connected in parallel to one first bypass switch 52, and the frequency levels of the different first low noise amplifiers 51 are different;

when the working frequency of the radio frequency circuit is matched with the frequency grade of the target first low noise amplifier, the radio frequency transceiver 2 firstly controls the target first bypass switch to be in an off state and controls the second bypass switch 62 to be in an on state, then demodulates the received signal after the first low noise amplification processing is carried out on the first low noise amplification module 5, and controls the target first bypass switch to be in an on state and controls the second bypass switch 62 to be in an off state under the condition that the demodulation fails;

the target first bypass switch is a first bypass switch 52 connected in parallel with the target first low noise amplifier, and the first bypass switches 52 connected in parallel with the other first low noise amplifiers 51 are in a conducting state, and the at least two first low noise amplifiers 51 connected in series include the target first low noise amplifier.

In an embodiment, the first bypass switches 52 connected in parallel to the at least two first low noise amplifiers 51 may be single pole single throw switches independent of each other, or the first bypass switches 52 connected in parallel to the at least two first low noise amplifiers 51 may be located in the same device, for example: in the case where the number of the first low noise amplifiers 51 is two, a double pole double throw switch may be provided to realize the function of the first bypass switch 52 connected in parallel to each of the two first low noise amplifiers 51, and this is not particularly limited.

It should be noted that, when the first low noise amplification module 5 is in an operating state, only one first low noise amplifier 51 of the at least two first low noise amplifiers 51 is in the operating state and the other first low noise amplifiers 51 are in an off state at the same time, that is, in the first bypass switches 52 connected in parallel to the at least two first low noise amplifiers 51, only one first bypass switch 52 is in an off state and the other first bypass switches 52 are in an on state at the same time.

The different first low noise amplifiers 51 may correspond to different frequency levels, and may be understood as follows: the frequency ranges of the received signals that can be effectively amplified by the different first low noise amplifiers 51 are different, for example: as shown in fig. 2, the first low noise amplification module 5 includes 3 first low noise amplifiers, which are respectively: a first low frequency low noise amplifier LNA-L, a first low frequency medium noise amplifier LNA-M and a first high frequency low noise amplifier LNA-H.

Correspondingly, after the radio frequency transceiver 2 controls the target first bypass switch to be in the off state and controls the second bypass switch 62 to be in the on state, if the demodulation of the received signal after the first low noise amplification processing is successfully performed on the first low noise amplification module 5, the target first bypass switch continues to be kept in the off state, and the second bypass switch 62 is in the on state, specifically: when the interference strength in the operating environment of the radio frequency circuit is small, the first low noise amplifier module 5 is controlled to be in an operating state, one first low noise amplifier 51 with a frequency level matching the current operating frequency of the radio frequency circuit is selected from the first low noise amplifier module 5 to be controlled to be in the operating state, and the other first low noise amplifiers 51 are controlled to be in a closed state, and because the interference strength in the operating environment of the radio frequency circuit is small, the radio frequency signal processed by the first low noise amplifier 51 with the frequency level matching the current operating frequency of the radio frequency circuit is small in environmental interference, and can be demodulated by the radio frequency transceiver 2.

For example: as shown in fig. 2, it is assumed that the first low noise amplification block 5 includes: in the case of LNA-L, LNA-M, LNA-H and the rf circuit operating in the high frequency mode, the rf transceiver 2 will control the first bypass switch 52 in parallel with LNA-H to be open and control the first bypass switches 52 in parallel with LNA-L and LNA-M to be closed.

In this embodiment, a plurality of first low noise amplifiers 51 having different frequency levels are provided in the first low noise amplification block 5, so as to improve the coverage of the frequency levels of the first low noise amplification block 5.

As an alternative implementation, as shown in fig. 2, the second low noise amplification module 6 includes at least two second low noise amplifiers 61 connected in series, and each second low noise amplifier 61 is connected in parallel with a second bypass switch 62, and the frequency levels of the different second low noise amplifiers 61 are different;

when the working frequency of the radio frequency circuit is matched with the frequency grade of the target second low noise amplifier, if the radio frequency transceiver 2 fails to demodulate the received signal after the first low noise amplification, the radio frequency transceiver 2 controls the first bypass switch 52 to be in a conducting state and controls the target second bypass switch to be in a disconnecting state;

the target second bypass switch is a second bypass switch connected in parallel with the target second low noise amplifier, and the second bypass switches connected in parallel with other second low noise amplifiers are in a conducting state, and the at least two second low noise amplifiers connected in series comprise the target second low noise amplifier.

The process of selecting the target second low noise amplifier from the at least two second low noise amplifiers is the same as the process of selecting the target first low noise amplifier from the at least two first low noise amplifiers in the above embodiment, and the matching degree between the frequency level of the second low noise amplifier module 6 and the working frequency of the radio frequency circuit can be improved as well, so that the amplification processing effect on the received signal is improved, and the receiving performance of the radio frequency circuit is improved, which is not described herein again.

It should be noted that, in the embodiment shown in fig. 2, at least two second low noise amplifiers 61 in the second low noise amplification module 6 are connected in parallel, so that two or more second low noise amplifiers 61 in the second low noise amplification module 6 may be in an operating state at the same time, that is, the number of the target second low noise amplifier core target second bypass switches may be greater than 1.

In this way, the plurality of second low noise amplifiers 61 can be simultaneously in an operating state, that is, the number of the second low noise amplifiers 61 included in the target second low noise amplifier can be 1 or more than 1, and thus, by combining the plurality of second low noise amplifiers 61 having different parameters, the frequency coverage of the second low noise amplification module 6 can be expanded.

Of course, in a specific implementation, at least two second low noise amplifiers 61 in the second low noise amplification module 6 may also be connected in series, and only one of the second low noise amplifiers 61 is activated to operate at a time, which is not limited herein.

It should be noted that, as technology develops, the frequency coverage of the low noise amplifiers will become wider, and when a low noise amplifier is enough to cover the operating frequency of the radio frequency circuit, only one first low noise amplifier 51 and/or only one second low noise amplifier 61 may be provided in the radio frequency circuit, as in the embodiment shown in fig. 2, the radio frequency circuit having a plurality of first low noise amplifiers 51 and a plurality of second low noise amplifiers 61 is only used as an exemplary illustration, and the number of the first low noise amplifiers 51 and the second low noise amplifiers 61 is not specifically limited herein.

As an optional implementation manner, as shown in fig. 2, the filtering module 3 includes N filters 31, and different filters 31 correspond to different operating frequency bands, the antenna switch 4 is a single-pole N-throw switch, and N is an integer greater than 1;

the output end of the first low noise amplification module 5 is connected with the first end (fixed end) of the single-pole N-throw switch 4, the N second ends (movable ends) of the single-pole N-throw switch 4 are respectively connected with the input ends of the N filters 31, and the output ends of the N filters 31 are respectively connected with the input end of the second low noise amplification module 6.

In implementation, the filters 31 having different operating frequency bands can have a better filtering effect on the received signals within the corresponding operating frequency bands, and as the bandwidth of the operating frequency band of the rf circuit is wider and wider, in this embodiment, a plurality of filters 31 corresponding to different operating frequency bands are disposed in the rf circuit, so that in operation, according to different operating frequencies of the rf circuit, the antenna switch 4 is controlled to connect one or more filters 31 corresponding to the operating frequency within the rf path, so as to start the one or more filters 31 for filtering, thereby improving the accuracy of the filtering module.

It should be noted that, as in the embodiment shown in fig. 2, only N is equal to 8 for example, and the number of filters 31 and the specific structure of the antenna switch 4 are not specifically limited herein.

As an alternative implementation, as shown in fig. 2, the second low noise amplification module 6 includes M second low noise amplifiers 61, M second bypass switches 62, and M change-over switches 63, where M is an integer greater than 1;

the M second bypass switches 62 are respectively connected in parallel with the M second low noise amplifiers 61, and the control end of the second low noise amplification module 6 includes the control ends of the M second bypass switches 62;

the input ends of the M second low noise amplifiers 61 are correspondingly connected to the output ends of the N filters 31 through the M switches 63, respectively;

the control ends of the M switches 63 are respectively connected to the radio frequency transceiver 2;

under the condition that the second low-noise amplification module 6 is in a working state, the target filter is connected with the radio frequency transceiver 2 through the target change-over switch and the target second low-noise amplifier;

under the condition that the second low-noise amplification module 6 is in a closed state, the target filter is connected with the radio frequency transceiver 2;

the target filter and the target second low-noise amplifier are respectively matched with the working frequency of the radio-frequency circuit, the target second bypass switch is connected with the target second low-noise amplifier in parallel, and the target change-over switch is connected between the target second low-noise amplifier and the target filter.

In a specific implementation, in a case where the second low noise amplification module 6 is in an off state, the target filter may be connected to the radio frequency transceiver 2 through the target switch and the second bypass switch 62, or the target filter may also be connected to the radio frequency transceiver 2 through a switch connected between the filtering module 3 and the radio frequency transceiver 2, and as in the embodiment shown in fig. 2, the target filter may be connected to the radio frequency transceiver 2 through the target switch and the second bypass switch 62 only by way of example, and is not limited specifically herein.

It should be noted that the number of the target filters and the target second low noise amplifiers may be 1 or more than 1, in implementation, one or more corresponding filters 31 may be selected to operate according to a frequency band where an actual operating frequency of the radio frequency circuit is located, and one or more second low noise amplifiers 61 may also be selected to operate, so as to better achieve an amplification effect on the received signal, which is not specifically limited herein.

It should be noted that, in the embodiment shown in fig. 2, M is equal to 5, and the 5 second low noise amplifiers include: a low frequency second low noise amplifier LNA0, two intermediate frequency second low noise amplifiers (LNA1 and LNA2), and two high frequency second low noise amplifiers (LNA3 and LNA4), the 5 switches comprising: a single-pole five-throw switch SW1, a single-pole three-throw switch SW2, and 3 single-pole four-throw switches (SW3, SW4, and SW 5).

In addition, as shown in fig. 2, the number of the filters 31 is 8, and the operating frequency bands of the 8 filters 31 are standard frequency bands: b1, B3, B5, B7, B8, B34, B39, B40, and B41.

At this time, the specific connection relationship between the switch 63 and the second low noise amplifier 62 is: a fixed end of SW1 is connected to an input end of LNA0, a fixed end of SW2 is connected to an input end of LNA1, a fixed end of SW3 is connected to an input end of LNA2, a fixed end of SW4 is connected to an input end of LNA3, and each of the active ends of SW1, SW2, SW3, and SW4 is connected in parallel to be connectable to any filter 31 among 8 filters 31.

In this embodiment, the selection of the radio frequency paths of multiple frequency bands can be realized by the switch, so as to select a low noise path with the minimum radio frequency loss from the multiple radio frequency paths, and further improve the receiving performance of the radio frequency circuit.

The specific configuration of the switch is not limited to the single-pole triple-throw, the single-pole four-throw, or the single-pole five-throw, and may be adaptively changed according to the number of filters, the corresponding operating frequency band, the number of second low noise amplifiers, the operating frequency band, and the like, and is not limited thereto.

In addition, in practical applications, the radio frequency circuit may include a plurality of antennas, and the number of the first low noise amplification module, the second low noise amplification module, and the filtering module may be adaptively increased based on a change in the number of the antennas, and the number of the first low noise amplification module, the second low noise amplification module, and the filtering module in the radio frequency circuit is not limited herein.

In the rf circuit shown in fig. 2, if the operating frequency of the rf circuit is within the low frequency band B5/B8, the specific operating process may include the following steps:

and step one, when the LNA-H and the LNA-M are in the off state, the low-frequency useful signal is transmitted to the LNA-L through the first bypass switch of the LNA-H and the first bypass switch of the LNA-M, and the loss of the received signal in the process is small. And the LNA-L is in the working state, the bypass switch of the LNA-L is opened, so that the received signal is amplified by the LNA-L and then transmitted to the radio frequency transceiver 2 through the single-pole 8 throw switch, the B5/B8 filter, the SW1 and the bypass switch of the LNA 0.

In implementation, the noise figure in the radio frequency circuit may be expressed as the following formula:

wherein, F_totalRepresenting the noise coefficient, F₁Representing the noise figure of level 1, G₁Representing the 1 st order gain factor.

The first low-noise amplification module 5 and the second low-noise amplification module 6 in the radio frequency circuit provided in the embodiment of the present application can be applied to the first-stage noise reduction processing, and it can be known from the above disclosure that since the second low-noise amplification module 6 at the front end is short-circuited by the bypass switch, only the loss (about 0.2dB-0.3dB) caused by the bypass switch can be taken into account, and the Noise Figure (NF) is reduced by 2-3dB

Step two, the radio frequency transceiver 2 judges whether the received signal can be demodulated.

In practice, the above demodulation failure may be caused by the following two situations:

case 1: the presence of an interfering signal out-of-band causes LNA-L saturation;

case 2: there is no useful signal input.

And executing a third step when the adjustment fails.

Step three, the radio frequency transceiver 2 controls the first low noise amplification module 5 and the second low noise amplification module 6 to adjust the working state, namely, the LNA-L, LNA-H and the LNA-M are both in the closed state, the low frequency useful signal sequentially passes through the bypass switches of the LNA-L, LNA-H and the LNA-M, then passes through the single-pole 8 throw switch, the B5/B8 filter and the SW1 to be transmitted to the LNA0, and at the moment, the LNA0 is in the working state to amplify the low frequency signal and then transmit the low frequency signal to the radio frequency transceiver 2.

Step four, the radio frequency transceiver 2 judges whether the received signal can be demodulated again, if the received signal can not be demodulated, the working state of the radio frequency circuit in the step one is adjusted to receive the signal; if the demodulation is possible, the working state of the radio frequency circuit in the step is continuously kept to receive the signal, and the error rate monitoring is carried out on the received signal at intervals of a preset time length (assuming that 1ms is used), specifically, if the error rate of the demodulated signal is greater than or equal to a preset value, the working state of the radio frequency circuit in the step one is adjusted to receive the signal.

In this step, when demodulation is still impossible, the following is shown: the signal received at the rf circuit is an interfering signal (i.e., no desired signal is received). In addition, when the above can be demodulated, but the error rate of the demodulated signal is greater than or equal to the preset value, it means: the operating environment of the radio frequency circuit changes, or the signal quality of the received signal changes, so that the second low-noise amplification module cannot meet the gain effect of the amplification processing of the received signal, and the first low-noise amplification module is switched to amplify the received signal.

Correspondingly, when the operating frequency of the rf circuit is within the intermediate frequency B1/B3, it is determined whether the received signal is amplified by the LNA-M or processed by the LNA1, and when the operating frequency of the rf circuit is within the high frequency B40/B41, it is determined whether the received signal is amplified by the LNA-H or processed by the LNA3, which is similar to the above-described process of amplifying the received signal by the LNA-L or processing the received signal by the LNA0 when the operating frequency of the rf circuit is within the low frequency B5/B8, and will not be described herein again.

The embodiment of the present application further provides an electronic device, which includes the radio frequency circuit in the circuit embodiment shown in fig. 1 or fig. 2.

In an implementation, the electronic device may be a mobile electronic device or a non-mobile electronic device. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a Personal Computer (PC), a Television (TV), a teller machine, a self-service machine, and the like, and the embodiments of the present application are not particularly limited.

In application, the electronic device can select one of the first low-noise amplification module and the second low-noise amplification module to be in a working state according to interference strength and the like in a specific working environment, so as to provide better gain configuration, and thus improve the signal receiving capability of the electronic device.

Referring to fig. 3, which is a flowchart of a signal processing method provided in an embodiment of the present application, the signal processing method can be applied to the electronic device provided in the previous embodiment, and as shown in fig. 3, the method may include the following steps:

step 301, performing a first low noise amplification process on a radio frequency signal received by an antenna by using a first low noise amplifier, performing a filtering process on the radio frequency signal after the first low noise amplification process, and performing a first demodulation process on the radio frequency signal after the filtering process.

In a specific implementation, the radio frequency signal received by the antenna may include: the radio frequency signal transmitting end transmits useful signals to the electronic equipment, interference signals in the operating environment where the radio frequency circuit is located and the like.

In this embodiment, the specific processes of performing the first low noise amplification processing on the radio frequency signal received by the antenna by using the first low noise amplifier, performing the filtering processing on the radio frequency signal after the first low noise amplification processing, and performing the first demodulation processing on the radio frequency signal after the filtering processing are the same as the processes of controlling the first low noise amplification module to be in the working state and controlling the second low noise amplification module to be in the off state in the embodiment shown in fig. 1 or fig. 2, and are not described herein again.

Step 302, performing response processing on the radio frequency signal after the first demodulation processing under the condition that the first demodulation processing does not meet a preset condition.

In a specific implementation, the preset conditions may include: and if the demodulation fails or the demodulated error rate is greater than the preset error rate, and the like, and the first demodulation process does not meet the preset condition, the first demodulation process indicates that the received signal in the radio frequency channel can be decoded and identified, so that the decoded signal is subjected to corresponding response processing, and the specific meaning of the response processing is the same as that of the process of responding to the received radio frequency signal in the prior art, and is not described herein again.

Step 303, under the condition that the first demodulation process meets the preset condition, turning off the first low noise amplifier, and performing a second low noise amplification process on the filtered radio frequency signal by using a second low noise amplifier, wherein the first demodulation process meets the preset condition and indicates that the demodulation fails.

In implementation, the specific process of turning off the first low noise amplifier and performing the second low noise amplification processing on the filtered radio frequency signal by using the second low noise amplifier is the same as the process of controlling the second low noise amplification module to be in the working state and controlling the first low noise amplification module to be in the off state in the embodiment shown in fig. 1 or fig. 2, and is not described herein again.

Optionally, after performing second low noise amplification processing on the filtered radio frequency signal by using a second low noise amplifier, the method further includes:

performing second demodulation processing on the radio frequency signal subjected to the second low-noise amplification processing;

under the condition that the second demodulation processing meets the preset condition, starting the first low noise amplifier, and closing the second low noise amplifier, so as to perform the first low noise amplification processing on the radio frequency signal by adopting the first low noise amplifier before the filtering processing;

or,

and under the condition that the second demodulation processing does not meet the preset condition, performing response processing on the radio-frequency signal subjected to the second demodulation processing.

In implementation, the above-mentioned process of starting the first low noise amplifier and turning off the second low noise amplifier to perform the first low noise amplification process on the radio frequency signal by using the first low noise amplifier before the filtering process when the second demodulation process satisfies the preset condition is the same as the process after the second low noise amplification module fails to demodulate as in the embodiment shown in fig. 1 or fig. 2; in addition, the above-mentioned process of performing response processing on the radio frequency signal after the second demodulation processing when the second demodulation processing does not satisfy the preset condition is the same as the process after the second low noise amplification module is successfully demodulated in the embodiment shown in fig. 1 or fig. 2, and has the same beneficial effects, and details are not repeated here.

Optionally, in a case where at least one of the first demodulation process and the second demodulation process does not satisfy a preset condition, the method further includes:

detecting an error rate of a demodulated signal corresponding to the radio frequency signal;

and when the error rate is larger than or equal to a preset value, neglecting the radio frequency signal, starting the first low noise amplifier, and closing the two low noise amplifiers.

In this embodiment, as in the embodiment shown in fig. 2, the error rate monitoring is performed on the received signal every preset time interval (assuming 1ms), which is the same as the process and can obtain the same beneficial effects, and further description is omitted here.

Optionally, when the number of the first low noise amplifiers is at least two, the performing, by using the first low noise amplifier, a first low noise amplification process on the radio frequency signal received by the antenna includes:

performing first low-noise amplification processing on a radio-frequency signal received by an antenna by using a target first low-noise amplifier matched with a target frequency band, wherein the target frequency band is the frequency band of the radio-frequency signal received by the antenna, and the at least two first low-noise amplifiers comprise the target first low-noise amplifier;

and/or the presence of a gas in the gas,

under the condition that the number of the second low noise amplifiers is at least two, performing second low noise amplification processing on the radio frequency signal after the filtering processing by adopting the second low noise amplifiers, including:

and performing second low-noise amplification processing on the radio-frequency signal received by the antenna by adopting a target second low-noise amplifier matched with a target frequency band, wherein the at least two second low-noise amplifiers comprise the target second low-noise amplifier.

The present embodiment can be applied to an electronic device including a plurality of first low noise amplifiers or a radio frequency circuit including a plurality of second low noise amplifiers (for example, a radio frequency circuit shown in fig. 2), and can select a low noise amplifier having the best gain effect from the first low noise amplifiers or the second low noise amplifiers according to the actual operating frequency of the radio frequency circuit to amplify a received signal, so as to further improve the gain effect and improve the receiving performance of the electronic device at the operating frequency.

The signal processing method provided by this embodiment can implement each process of the radio frequency circuit provided in the circuit embodiment shown in fig. 1 or fig. 2, and can obtain the same beneficial effect, and is not described herein again to avoid repetition.

The following takes the application to a terminal device having a radio frequency circuit as shown in fig. 2 as an example, and illustrates a signal processing method provided in the embodiment of the present application:

as shown in fig. 4, the signal processing method provided in the embodiment of the present application may include the following steps:

step 401, determining a working frequency band of the terminal.

The step may specifically be: it is determined whether an operating frequency band of the terminal is a low frequency, an intermediate frequency, or a high frequency.

Step 402, selecting one of LNA-L, LNA-M and LNA-H to operate first, which matches the operating frequency band.

The step may specifically be: selecting an LNA-L to be in a working state under the condition that the working frequency band of the terminal is low frequency; selecting an LNA-M to be in a working state under the condition that the working frequency band of the terminal is the intermediate frequency; and selecting the LNA-H to be in the working state under the condition that the working frequency band of the terminal is high frequency.

In step 403, the received signal is sequentially transmitted to the second low noise amplification module 6 through the first low noise amplification module 5, the antenna switch 4 and the filtering module 3.

Step 404, LNA0, LNA1, LNA2 and LNA3 are all turned off and the received signal is transmitted to the radio frequency transceiver 2 through its bypass (the bypass where the second bypass switch 62 is located).

In step 405, the radio frequency transceiver 2 determines whether or not the received signal can be demodulated.

If the determination result in this step is "yes", step 406 is executed; if the determination result in this step is "no", step 407 is executed.

Step 406, the current communication state is maintained and the signal quality is detected every 1 ms.

In this step, the signal quality of the received signal may be determined by detecting the error rate after demodulating the received signal, and when the error rate is greater than a preset value, the signal quality of the received signal is poor, so as to switch to the operating state of the radio frequency circuit in the above steps 402 to 404; otherwise, the current communication state is continuously kept until the communication is finished.

Step 407, turning off LNA-L, LNA-M and LNA-H.

In step 408, the received signal passes through the bypass of the first low noise amplification module 5 (the bypass where the first bypass switch 52 is located), the antenna switch 4 and the filtering module 3 in sequence, and is transmitted to the second low noise amplification module 6.

And 409, selecting at least one operation matched with the operation frequency band from the LNA0, the LNA1, the LNA2 and the LNA3, and selecting a low noise path for transmitting the received signal to the radio frequency transceiver.

In this step, the selecting of the low noise path for the received signal to be transmitted to the rf transceiver may be: one or more of the plurality of filters and the plurality of second low noise amplifiers 61 having the lowest noise figure are selected by the antenna switch 4, the changeover switch 63, and the like, so that the reception signal is transmitted through the radio frequency path in which the selected target filter and the target second low noise amplifier are located.

The signal processing method provided by the present embodiment can perform each process of the rf circuit shown in fig. 2, and can obtain the same beneficial effects, and is not described herein again to avoid repetition.

Optionally, as shown in fig. 5, an electronic device 500 is further provided in this embodiment of the present application, and includes a processor 501, a memory 502, and a program or an instruction stored in the memory 502 and executable on the processor 501, where the program or the instruction is executed by the processor 501 to implement each process of the signal processing method embodiment, and can achieve the same technical effect, and no further description is provided here to avoid repetition.

It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and the non-mobile electronic devices described above.

Fig. 6 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.

The electronic device 600 includes, but is not limited to: a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 608, a memory 609, a processor 610, and the like.

Those skilled in the art will appreciate that the electronic device 600 may further comprise a power source (e.g., a battery) for supplying power to the various components, and the power source may be logically connected to the processor 610 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system. The electronic device structure shown in fig. 6 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is omitted here.

The radio frequency unit 601 is configured to perform first low noise amplification processing on a radio frequency signal received by an antenna by using a first low noise amplifier, perform filtering processing on the radio frequency signal after the first low noise amplification processing, and perform first demodulation processing on the radio frequency signal after the filtering processing;

a processor 610, configured to perform response processing on the radio frequency signal after the first demodulation processing when the first demodulation processing does not satisfy a preset condition;

the radio frequency unit 601 is further configured to, when the first demodulation process meets the preset condition, close the first low noise amplifier, and perform a second low noise amplification process on the filtered radio frequency signal by using a second low noise amplifier, where the first demodulation process meets the preset condition and indicates that the demodulation fails.

Optionally, after the radio frequency unit 601 performs the second low noise amplification processing on the filtered radio frequency signal by using a second low noise amplifier;

the radio frequency unit 601 is further configured to perform second demodulation processing on the radio frequency signal after the second low-noise amplification processing;

a radio frequency unit 601, further configured to start the first low noise amplifier and close the second low noise amplifier when the second demodulation process meets the preset condition, so as to perform the first low noise amplification process on the radio frequency signal by using the first low noise amplifier before the filtering process;

the processor 610 is further configured to perform response processing on the radio frequency signal after the second demodulation processing when the second demodulation processing does not satisfy the preset condition.

Optionally, the processor 610, in a case that it is determined that at least one of the first demodulation process and the second demodulation process does not satisfy a preset condition, is further configured to:

and when the error rate is greater than or equal to a preset value, ignoring the radio frequency signal, and controlling the radio frequency unit 601 to start the first low noise amplifier and to close the two low noise amplifiers.

Optionally, in a case that the number of the first low noise amplifiers is at least two, the performing, by the radio frequency unit 601, a first low noise amplification process on the radio frequency signal received by the antenna by using the first low noise amplifier includes:

and/or the presence of a gas in the gas,

The electronic device provided in the embodiment of the present application can perform the steps in the method embodiments shown in fig. 3 or fig. 4, and can implement the working processes of the radio frequency circuit shown in fig. 1 or fig. 2, and can obtain the same beneficial effects as the radio frequency circuit shown in fig. 1 or fig. 2, and therefore, for avoiding repetition, details are not repeated here.

It should be understood that, in the embodiment of the present application, the input Unit 604 may include a Graphics Processing Unit (GPU) and a microphone, and the Graphics Processing Unit processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 606 may include a display panel, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 607 includes a touch panel and other input devices. Touch panels, also known as touch screens. The touch panel may include two parts of a touch detection device and a touch controller. Other input devices may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein. The memory 609 may be used to store software programs as well as various data including, but not limited to, application programs and an operating system. The processor 610 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 610.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the signal processing method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the signal processing method embodiment, and can achieve the same technical effect, and the details are not repeated here to avoid repetition.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A radio frequency circuit, comprising: the antenna, the radio frequency transceiver, the filtering module, the antenna switch, the first low-noise amplification module and the second low-noise amplification module;

the radio frequency transceiver controls one of the first low noise amplification module and the second low noise amplification module to be in a working state and controls the other one of the first low noise amplification module and the second low noise amplification module to be in a closed state according to the analysis condition of the received signal.

2. The radio frequency circuit of claim 1, wherein:

the first low noise amplification module includes: a first low noise amplifier and a first bypass switch in parallel with the first low noise amplifier;

the second low noise amplification module includes: a second low noise amplifier and a second bypass switch in parallel with the second low noise amplifier;

the control end of the first low-noise amplification module is the control end of the first bypass switch, and the control end of the second low-noise amplification module is the control end of the second bypass switch;

wherein, under the condition that the first bypass switch is in a conducting state, the first low-noise amplification module is in a closing state; under the condition that the first bypass switch is in an off state, the first low-noise amplification module is in a working state;

under the condition that the second bypass switch is in a conducting state, the second low-noise amplification module is in a closing state; and under the condition that the second bypass switch is in an off state, the second low-noise amplification module is in a working state.

3. The radio frequency circuit according to claim 2, wherein the first low noise amplifier module comprises at least two first low noise amplifiers connected in series, and each first low noise amplifier is connected in parallel with a first bypass switch, and the frequency levels of the different first low noise amplifiers are different;

when the working frequency of the radio frequency circuit is matched with the frequency grade of a target first low noise amplifier, the radio frequency transceiver controls a target first bypass switch to be in an off state and controls a second bypass switch to be in an on state; and controlling the target first bypass switch to be in a conducting state and controlling the second bypass switch to be in a disconnecting state under the condition that the radio frequency transceiver fails to demodulate the received signal;

the target first bypass switch is a first bypass switch connected in parallel with the target first low noise amplifier, and the first bypass switches connected in parallel with other first low noise amplifiers are in a conducting state, and the at least two first low noise amplifiers connected in series comprise the target first low noise amplifier.

4. The radio frequency circuit according to claim 3, wherein the second low noise amplification module includes at least two second low noise amplifiers connected in series, and each of the second low noise amplifiers is connected in parallel with a respective one of the second bypass switches, and the frequency levels of the different second low noise amplifiers are different;

when the working frequency of the radio frequency circuit is matched with the frequency grade of a target second low-noise amplifier, if the radio frequency transceiver fails to demodulate the received signal after the first low-noise amplification processing, the radio frequency transceiver controls the first bypass switch to be in a conducting state and controls the target second bypass switch to be in a disconnecting state;

5. The RF circuit of claim 1, wherein the filtering module comprises N filters, and different filters correspond to different operating frequency bands, the antenna switch is a single-pole N-throw switch, and N is an integer greater than 1;

the output end of the first low-noise amplification module is connected with the first end of the single-pole N-throw switch, the N second ends of the single-pole N-throw switch are respectively connected with the input ends of the N filters, and the output ends of the N filters are respectively connected with the input end of the second low-noise amplification module.

6. The RF circuit of claim 5, wherein the second low noise amplification module comprises M second low noise amplifiers, M second bypass switches, and M switches, M being an integer greater than 1;

the M second bypass switches are respectively connected with the M second low-noise amplifiers in parallel, and the control end of the second low-noise amplification module comprises the control ends of the M second bypass switches;

the input ends of the M second low-noise amplifiers are correspondingly connected with the output ends of the N filters through the M selector switches respectively;

the control ends of the M change-over switches are respectively connected with the radio frequency transceiver;

under the condition that the second low-noise amplification module is in a working state, the target filter is connected with the radio frequency transceiver through the target selector switch and the target second low-noise amplifier;

under the condition that the second low-noise amplification module is in a closed state, a target filter is connected with the radio frequency transceiver;

7. An electronic device, characterized in that the electronic device comprises a radio frequency circuit according to any of claims 1-6.

8. A signal processing method applied to the electronic device according to claim 7, the method comprising:

9. The method of claim 8, wherein after the second low noise amplification process is performed on the filtered rf signal by using a second low noise amplifier, the method further comprises:

10. The method according to claim 9, wherein in a case where at least one of the first demodulation process and the second demodulation process does not satisfy a preset condition, the method further comprises:

11. The method of claim 8, wherein in the case that the number of the first low noise amplifiers is at least two, performing a first low noise amplification process on the radio frequency signal received by the antenna by using the first low noise amplifiers comprises:

and/or the presence of a gas in the gas,

12. An electronic device comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the signal processing method according to any one of claims 8-11.

13. A readable storage medium, characterized in that the readable storage medium stores thereon a program or instructions which, when executed by a processor, implement the steps of the signal processing method according to any one of claims 8-11.