CN210609168U - Automatic control circuit of transceiver front-end switch and transceiving system - Google Patents
Automatic control circuit of transceiver front-end switch and transceiving system Download PDFInfo
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- CN210609168U CN210609168U CN201922219034.0U CN201922219034U CN210609168U CN 210609168 U CN210609168 U CN 210609168U CN 201922219034 U CN201922219034 U CN 201922219034U CN 210609168 U CN210609168 U CN 210609168U
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Abstract
The utility model provides a transceiver front end switch automatic control circuit and receiving and dispatching system, include: the signal receiving module is connected with a first static contact of the radio frequency switch; the coupler is connected with the output end of the signal sending module and divides the signal into a first radio frequency signal and a second radio frequency signal to be output, wherein the power of the first radio frequency signal is less than that of the second radio frequency signal; the detection module is connected with the output end of the coupler, detects the first radio frequency signal and generates a corresponding switch control signal; and the control end of the radio frequency switch is connected with the output end of the detection module, and the movable contact based on the control radio frequency switch is communicated with the first fixed contact or the second fixed contact. The utility model discloses a detect the operating condition that the radio frequency signal that awaits sending controlled the radio frequency switch, realize the radio frequency and receive and the automatic switch-over of transmission, need not extra logic circuit and carry out receiving and dispatching control to the radio frequency front end device, circuit structure is simple, and the logic is simple, and stability is high, and is with low costs.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a transceiver front end switch automatic control circuit and receiving and dispatching system.
Background
Time division duplex is a duplex mode of a communication system, receiving and transmitting are carried out in different time slots of the same frequency channel, the receiving and transmitting channels are separated by using guaranteed time, broadband resources can be fully utilized, the channel utilization rate is improved, and the time division duplex is widely applied to the communication system.
In the design of a high-frequency time division transceiver circuit system, a General-purpose input/output (GPIO) in a logic circuit is usually required to control a radio frequency switch in a front-end module of the transceiver circuit. With this design, an additional digital circuit is required to control the rf switch in coordination with the timing of the time division system, which is complicated to control, and if the timing design is not proper, the performance of the whole system is easily deteriorated.
Therefore, how to simplify the control circuit and logic of the rf switch in the high frequency time division transceiver circuit and ensure the system stability has become one of the problems to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an automatic control circuit and a transceiver system for a radio frequency switch in the prior art, which are used to solve the problems of complicated control circuit and logic, poor system stability, etc. of the radio frequency switch.
To achieve the above and other related objects, the present invention provides a transceiver front-end switch automatic control circuit, which at least comprises:
the device comprises a signal receiving module, a signal sending module, a radio frequency switch, a coupler and a detection module;
the signal receiving module is connected with the first stationary contact of the radio frequency switch and used for receiving a signal input from the first stationary contact of the radio frequency switch;
the coupler is connected between the output end of the signal sending module and the second stationary contact of the radio frequency switch, and divides an output signal of the signal sending module into a first radio frequency signal and a second radio frequency signal to be output, wherein the power of the first radio frequency signal is smaller than that of the second radio frequency signal;
the detection module is connected with the output end of the coupler, detects the first radio frequency signal and generates a corresponding switch control signal;
the control end of the radio frequency switch is connected with the output end of the detection module, and the movable contact of the radio frequency switch is controlled to be communicated with the first fixed contact or the second fixed contact based on the switch control signal.
Optionally, the signal receiving module comprises a low noise amplifier.
More optionally, the signal receiving module further includes an input filter, an input end of the input filter is connected to the radio frequency switch, and an output end of the input filter is connected to an input end of the low noise amplifier.
Optionally, the signal transmission module comprises a power amplifier.
More optionally, the signal sending module further includes an output filter, an input end of the output filter is connected to the radio frequency signal to be sent, and an output end of the output filter is connected to the input end of the power amplifier.
Optionally, the radio frequency switch is a switch of a single-pole double-throw structure.
More optionally, the detection module includes a detection unit and a trigger unit; the detection unit is connected with the output end of the coupler and outputs a trigger control signal after detecting a radio frequency signal to be sent; the trigger unit is connected with the output end of the detection unit and triggers the switch control signal based on the trigger control signal.
More optionally, the detection unit comprises a detector circuit.
More optionally, the trigger unit comprises a schmitt trigger.
To achieve the above and other related objects, the present invention provides a transceiver system, which at least comprises:
the antenna, the transceiver front end switch automatic control circuit and the signal processing circuit;
the antenna is connected with a movable contact of a radio frequency switch in the transceiver front-end switch automatic control circuit and is used for realizing the conversion of electromagnetic waves and radio frequency signals;
the signal processing circuit is respectively connected with the output end of the signal receiving module and the input end of the signal sending module in the transceiver front-end switch automatic control circuit and is used for processing the sent and received signals.
As described above, the utility model discloses a transceiver front end switch automatic control circuit and receiving and dispatching system has following beneficial effect:
the utility model discloses a transceiver front end switch automatic control circuit and receiving and dispatching system control radio frequency switch's operating condition through the radio frequency signal that detects to be sent, realize the radio frequency and receive and the automatic switch-over of transmission, need not extra logic circuit and carry out receiving and dispatching control to radio frequency front end device, and circuit structure is simple, and the logic is simple, and stability is high, and is with low costs.
Drawings
Fig. 1 is a schematic structural diagram of an automatic control circuit of a transceiver front-end switch according to the present invention.
Fig. 2 shows a schematic structural diagram of the detection module of the present invention.
Fig. 3 is a schematic structural diagram of the transceiver system of the present invention.
Description of the element reference numerals
1 transceiver front-end switch automatic control circuit
11 signal receiving module
111 low noise amplifier
112 input filter
12 signal transmitting module
121 power amplifier
122 output filter
13 radio frequency switch
14 coupler
15 detection module
151 detection unit
152 triggering unit
2 aerial
3 signal processing circuit
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
Please refer to fig. 1 to 3. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
Example one
As shown in fig. 1, the present embodiment provides an automatic control circuit 1 for a transceiver front-end switch, where the automatic control circuit 1 for a transceiver front-end switch includes:
the system comprises a signal receiving module 11, a signal sending module 12, a radio frequency switch 13, a coupler 14 and a detection module 15.
As shown in fig. 1, the signal receiving module 11 is connected to the first stationary contact of the radio frequency switch 13, and is configured to receive a signal input from the first stationary contact of the radio frequency switch 13.
Specifically, in this embodiment, the signal receiving module 11 includes a low noise amplifier 111, an input end of the low noise amplifier 111 is connected to the radio frequency switch 13, and an output end of the low noise amplifier 111 outputs the received signal. The low noise amplifier 111 is used to amplify the received signal and improve the signal-to-noise ratio. The low noise amplifier 111 may adopt any circuit structure capable of amplifying signals and having a high signal-to-noise ratio, which is not described herein again.
It should be noted that, in an application scenario with a low requirement on the noise figure, the signal receiving module 11 may use another preamplifier with a low signal-to-noise ratio, and is not limited to this embodiment.
As another implementation manner of the present invention, the signal receiving module 11 further includes an input filter 112. The input end of the input filter 112 is connected to the radio frequency switch 13, the output end is connected to the input end of the low noise amplifier 111, and the input filter 112 filters the input radio frequency signal to reduce interference and improve the accuracy of subsequent signal processing.
As shown in fig. 1, the signal transmission module 12 transmits a signal via the radio frequency switch 13.
Specifically, in this embodiment, the signal transmitting module 12 includes a power amplifier 121, an input end of the power amplifier 121 is connected to a radio frequency signal to be transmitted, and an output end of the power amplifier 121 outputs the power-amplified radio frequency signal. The power amplifier 121 is configured to amplify and output a radio frequency signal to be transmitted. The power amplifier 121 may adopt any circuit structure capable of amplifying signals, which is not described herein in detail.
As another implementation manner of the present invention, the signal transmitting module 12 further includes an output filter 122. The output filter 122 is connected to an input end of the power amplifier 121, and filters a radio frequency signal to be transmitted to reduce interference.
As shown in fig. 1, the coupler 14 is connected between the output end of the signal transmitting module 12 and the second stationary contact of the rf switch 13, and divides the output signal of the signal transmitting module 12 into a first rf signal and a second rf signal for output, where the power of the first rf signal is smaller than that of the second rf signal.
Specifically, the coupler 14 is configured to distribute power, and divide a path of radio frequency signal output by the signal sending module 12 into two paths, which are the first radio frequency signal and the second radio frequency signal respectively, where the first radio frequency signal includes a small part of energy in the radio frequency signal output by the signal sending module 12, and the second radio frequency signal includes a large part of energy in the radio frequency signal output by the signal sending module 12. A small amount of energy contained in the first radio frequency signal can be detected, and the smaller the energy is, the better the energy is, and specific numerical values are not repeated herein.
As shown in fig. 1, the detecting module 15 is connected to the output end of the coupler 14, and detects the first rf signal and generates a corresponding switch control signal.
Specifically, as shown in fig. 2, the detecting module 15 includes a detecting unit 151 and a triggering unit 152. The detecting unit 151 is connected to the output end of the coupler 14, and outputs a trigger control signal when detecting a radio frequency signal. In this embodiment, the detecting unit 151 is implemented by a detector circuit, which includes a detector diode D and a capacitor C; the anode of the detection diode D is connected with the first radio-frequency signal, and the cathode of the detection diode D outputs a trigger control signal; one end of the capacitor C is connected with the cathode of the detection diode D, and the other end of the capacitor C is grounded. The triggering unit 152 is connected to an output end of the detecting unit 151, and triggers and outputs the switch control signal based on the trigger control signal. In this embodiment, the trigger unit 152 is implemented by using a schmitt trigger, which can be implemented by using a tunnel diode structure, and accessing a positive feedback comparator structure or two cross-coupled transistor structures, which are not described herein again. The triggering unit 152 may also adopt other circuit structures with triggering functions, and is not limited to this embodiment.
It should be noted that, the circuit structure that can arbitrarily detect the rf signal output by the coupler 14 and generate the switch control signal based on the detected signal is applicable to the detection module 15 of the present invention, and is not limited to this embodiment.
As shown in fig. 1, the control terminal of the rf switch 13 is connected to the output terminal of the detection module 15, and the movable contact of the rf switch 13 is controlled to communicate with the first stationary contact or the second stationary contact based on the switch control signal.
Specifically, in this embodiment, the radio frequency switch 13 adopts a switch with a single-pole double-throw structure, and includes a moving contact and two fixed contacts, a first fixed contact of the radio frequency switch 13 is connected to the signal receiving module 11, a second fixed contact of the radio frequency switch is connected to the coupler 14, and the moving contact is connected to an external antenna. Based on the control of the switch control signal, the radio frequency switch 13 can realize the connection between the movable contact and the first stationary contact or between the movable contact and the second stationary contact. When the signal sending module 12 sends a signal, the switch control signal controls the movable contact of the radio frequency switch 13 to be connected with the second fixed contact, and at this time, the transceiver is in a transmitting mode; when the signal sending module 12 does not send a signal, the switch control signal controls the movable contact of the radio frequency switch 13 to be connected with the first fixed contact, and at this time, the transceiver is in a receiving mode.
It should be noted that the radio frequency switch 13 may be implemented by a transistor structure, a mechanical structure, or a combination of the two, which is not described herein in detail.
The utility model discloses a transceiver front end switch automatic control circuit 1's theory of operation as follows:
when the signal transmitting module 12 outputs a radio frequency signal, the coupler 14 divides the radio frequency signal into a first radio frequency signal and a second radio frequency signal with different powers. The detection module 15 detects the first rf signal by detecting, generates a trigger control signal after detecting the first rf signal, and triggers the switch control signal based on the trigger control signal to control the movable contact of the rf switch 13 to be connected with the second stationary contact, that is, in a sending mode.
When the signal sending module 12 does not output the radio frequency signal, the output of the coupler 14 is zero, and the level detected by the detecting module 15 is 0, the trigger control signal does not act, the switch control signal output by the detecting module 15 does not act, and the movable contact of the radio frequency switch 13 is connected with the first stationary contact, that is, in the receiving mode.
The utility model discloses a transceiver front end switch automatic control circuit 1 avoids using complicated circuit structure and logic relation, can realize the automatic switch-over of radio frequency receipt and transmission, and stability is high, and is with low costs.
Example two
As shown in fig. 3, the present embodiment provides a transceiver system, which includes:
an antenna 2, a transceiver front end switch automatic control circuit 1 and a signal processing circuit 3.
As shown in fig. 3, the antenna 2 is connected to the moving contact of the rf switch 13 in the transceiver front-end switch automatic control circuit 1, and is used for implementing the conversion between the electromagnetic wave and the rf signal.
Specifically, the antenna 2 is used for both transmitting and receiving signals, and the switching of the operation mode is realized through the radio frequency switch 13. The antenna 2 may select a monopole antenna, an inverted-F antenna, a loop antenna, a monopole + parasitic antenna, or a coupled feed point antenna according to the use requirement, which is not described herein again.
As shown in fig. 3, the transceiver front-end switch automatic control circuit 1 is connected to the antenna 2, and is configured to implement automatic control of a transceiving mode.
Specifically, the structure and principle of the transceiver front-end switch automatic control circuit 1 are described in the first embodiment, which is not described herein again.
As shown in fig. 3, the signal processing circuit 3 is respectively connected to the output end of the signal receiving module 11 and the input end of the signal sending module 12 in the transceiver front-end switch automatic control circuit 1, and is configured to process the sent and received signals.
Specifically, the signal processing circuit 3 includes, but is not limited to, a modem, a frequency divider, a mixer, a digital processor, a filter, a phase detector, etc., and may be configured according to design requirements.
The utility model discloses a receiving and dispatching system can realize the automatic switch-over of radio frequency receipt and transmission, and system structure is simple, and the logic is simple, and stability is high, and is with low costs.
To sum up, the utility model provides a transceiver front end switch automatic control circuit and receiving and dispatching system, include: the device comprises a signal receiving module, a signal sending module, a radio frequency switch, a coupler and a detection module; the signal receiving module is connected with the first stationary contact of the radio frequency switch and used for receiving a signal input from the first stationary contact of the radio frequency switch; the coupler is connected between the output end of the signal sending module and the second stationary contact of the radio frequency switch, and divides an output signal of the signal sending module into a first radio frequency signal and a second radio frequency signal to be output, wherein the power of the first radio frequency signal is smaller than that of the second radio frequency signal; the detection module is connected with the output end of the coupler, detects the first radio frequency signal and generates a corresponding switch control signal; the control end of the radio frequency switch is connected with the output end of the detection module, and the movable contact of the radio frequency switch is controlled to be communicated with the first fixed contact or the second fixed contact based on the switch control signal. The utility model discloses a transceiver front end switch automatic control circuit and receiving and dispatching system control radio frequency switch's operating condition through the radio frequency signal that detects to be sent, realize the radio frequency and receive and the automatic switch-over of transmission, need not extra logic circuit and carry out receiving and dispatching control to radio frequency front end device, and circuit structure is simple, and the logic is simple, and stability is high, and is with low costs. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An automatic control circuit for a transceiver front-end switch, the automatic control circuit comprising at least:
the device comprises a signal receiving module, a signal sending module, a radio frequency switch, a coupler and a detection module;
the signal receiving module is connected with the first stationary contact of the radio frequency switch and used for receiving a signal input from the first stationary contact of the radio frequency switch;
the coupler is connected between the output end of the signal sending module and the second stationary contact of the radio frequency switch, and divides an output signal of the signal sending module into a first radio frequency signal and a second radio frequency signal to be output, wherein the power of the first radio frequency signal is smaller than that of the second radio frequency signal;
the detection module is connected with the output end of the coupler, detects the first radio frequency signal and generates a corresponding switch control signal;
the control end of the radio frequency switch is connected with the output end of the detection module, and the movable contact of the radio frequency switch is controlled to be communicated with the first fixed contact or the second fixed contact based on the switch control signal.
2. The transceiver front-end switch automatic control circuit of claim 1, characterized in that: the signal receiving module comprises a low noise amplifier.
3. The transceiver front-end switch automatic control circuit of claim 2, characterized in that: the signal receiving module further comprises an input filter, wherein the input end of the input filter is connected with the radio frequency switch, and the output end of the input filter is connected with the input end of the low noise amplifier.
4. The transceiver front-end switch automatic control circuit of claim 1, characterized in that: the signal transmission module comprises a power amplifier.
5. The transceiver front-end switch automatic control circuit of claim 4, characterized in that: the signal transmission module further comprises an output filter, wherein the input end of the output filter is connected with a radio-frequency signal to be transmitted, and the output end of the output filter is connected with the input end of the power amplifier.
6. The transceiver front-end switch automatic control circuit of claim 1, characterized in that: the radio frequency switch is a switch with a single-pole double-throw structure.
7. The transceiver front-end switch automatic control circuit according to any one of claims 1 to 6, characterized in that: the detection module comprises a detection unit and a trigger unit; the detection unit is connected with the output end of the coupler and outputs a trigger control signal after detecting a radio frequency signal to be sent; the trigger unit is connected with the output end of the detection unit and triggers the switch control signal based on the trigger control signal.
8. The transceiver front-end switch automatic control circuit of claim 7, characterized by: the detection unit includes a detection circuit.
9. The transceiver front-end switch automatic control circuit of claim 7, characterized by: the trigger unit includes a schmitt trigger.
10. A transceiver system, characterized in that the transceiver system comprises at least:
an antenna, a transceiver front end switch automatic control circuit and a signal processing circuit according to any one of claims 1 to 9;
the antenna is connected with a movable contact of a radio frequency switch in the transceiver front-end switch automatic control circuit and is used for realizing the conversion of electromagnetic waves and radio frequency signals;
the signal processing circuit is respectively connected with the output end of the signal receiving module and the input end of the signal sending module in the transceiver front-end switch automatic control circuit and is used for processing the sent and received signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922219034.0U CN210609168U (en) | 2019-12-06 | 2019-12-06 | Automatic control circuit of transceiver front-end switch and transceiving system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922219034.0U CN210609168U (en) | 2019-12-06 | 2019-12-06 | Automatic control circuit of transceiver front-end switch and transceiving system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112929052A (en) * | 2019-12-06 | 2021-06-08 | 上海新微技术研发中心有限公司 | Automatic control circuit of transceiver front-end switch and transceiving system |
| CN114157317A (en) * | 2020-08-17 | 2022-03-08 | 湖南智领通信科技有限公司 | Radio frequency front end of intelligent hardware frequency conversion |
-
2019
- 2019-12-06 CN CN201922219034.0U patent/CN210609168U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112929052A (en) * | 2019-12-06 | 2021-06-08 | 上海新微技术研发中心有限公司 | Automatic control circuit of transceiver front-end switch and transceiving system |
| CN114157317A (en) * | 2020-08-17 | 2022-03-08 | 湖南智领通信科技有限公司 | Radio frequency front end of intelligent hardware frequency conversion |
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