CN114337705A - Intermodulation interference suppression circuit and electronic device - Google Patents
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Abstract
The application discloses intermodulation interference suppression circuit and electronic device includes: the device comprises a switch tube and two band-stop filters, wherein the two band-stop filters are arranged at the PCB wiring positions of two connecting ends of the switch tube respectively and used for filtering radio-frequency signals generating intermodulation interference to suppress the intermodulation interference, the distance between the two band-stop filters is a preset value, and the preset value is set according to the radio-frequency signals generating the intermodulation interference. Therefore, according to the technical scheme provided by the application, the band elimination filters are respectively arranged at the PCB wiring positions at the two ends of the switch tube, the frequency signals generating the intermodulation interference are filtered by utilizing the performance of the band elimination filters, and the frequency signals are prevented from entering the switch tube to generate the intermodulation interference.
Description
Technical Field
The present application relates to the field of communications, and in particular, to an intermodulation interference suppression circuit and an electronic device.
Background
Intermodulation interference is generated by a nonlinear circuit in a transmission channel, when signals of two or more different frequencies are input to the nonlinear circuit, due to the action of the nonlinear device, many harmonics and combined frequency components are generated, wherein the combined frequency components close to the desired signal frequency can successfully pass through a receiver to form interference, and the interference is called intermodulation interference. Among the common non-linear devices are diodes, thyristors, etc.
Intermodulation interference is often generated in application scenarios such as communication, for example, in a microwave detection technology for detecting whether living bodies such as people or animals come in and go out in a certain area, when a rectifying circuit in a microwave sensor is close to a radio frequency circuit and reverse voltages received at two ends of a diode in the rectifying circuit are changed, a PN junction capacitance generated by the diode is changed, so that the diode becomes a nonlinear device, when a frequency signal transmitted by the sensor and a frequency signal generated by a mains supply simultaneously enter the diode, the nonlinear characteristic of the diode causes the generation of intermodulation interference, and further the normal operation of the sensor is directly influenced, so that the phenomena of missing report and false report occur. Therefore, it becomes important to reduce intermodulation interference in various application scenarios.
Therefore, how to suppress intermodulation interference is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims at providing an intermodulation interference suppression circuit and an electronic device, wherein the PCB wiring positions of two connecting ends of a switch tube of a nonlinear device are respectively provided with a band elimination filter, and the band elimination filter filters out an intermodulation interference-generating video radio frequency signal so as to suppress the intermodulation interference.
In order to solve the above technical problem, the present application provides an intermodulation interference suppression circuit, including: a switch tube and a band elimination filter;
the two band-stop filters are respectively arranged at the PCB wiring positions of the two connecting ends of the switch tube, and the distance between the two band-stop filters is a preset value and is used for filtering radio-frequency signals generating intermodulation interference so as to inhibit the intermodulation interference; wherein the preset value is set according to the wavelength of the radio frequency signal.
And the band elimination filters are attached to the PCB wire.
The length of each band elimination filter is set according to the wavelength of the radio frequency signal.
The intermodulation interference suppression circuit further comprises a first inductor and a second inductor;
the first inductor is connected with one end of the switch tube, and the second inductor is connected with the other end of the switch tube.
The intermodulation interference suppression circuit further comprises a capacitor;
one end of the capacitor is connected with the common end of the first inductor and the switch tube, and the other end of the capacitor is connected with the common end of the second inductor and the switch tube.
The band elimination filter is a coupling type microstrip wave trapper.
Wherein, the switch tube is a diode.
The intermodulation interference suppression circuit also comprises a frequency signal detection unit and an alarm device;
the frequency signal detection unit is connected with the switching tube and is used for collecting the frequency signal entering the switching tube;
the alarm device is connected with the frequency signal detection unit and used for sending out an alarm signal when the frequency signal acquired by the frequency signal detection unit meets a preset condition.
In order to solve the above technical problem, the present application further provides an electronic device, which includes an electronic device body, and further includes the intermodulation interference suppression circuit as described above.
Wherein, the electronic device body is a microwave sensor or a relay.
The application provides an intermodulation interference suppression circuit, includes: the device comprises a switch tube and two band-stop filters, wherein the two band-stop filters are arranged at the PCB wiring positions of two connecting ends of the switch tube respectively and used for filtering radio-frequency signals generating intermodulation interference to suppress the intermodulation interference, the distance between the two band-stop filters is a preset value, and the preset value is set according to the radio-frequency signals generating the intermodulation interference. Therefore, according to the technical scheme provided by the application, the band elimination filters are respectively arranged at the PCB wiring positions at the two ends of the switch tube, the frequency signals generating the intermodulation interference are filtered by utilizing the performance of the band elimination filters, and the frequency signals are prevented from entering the switch tube to generate the intermodulation interference.
In addition, the application also provides an electronic device, which comprises the intermodulation interference suppression circuit and has the same effect as the intermodulation interference suppression circuit.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic diagram of an intermodulation interference suppression circuit provided in an embodiment of the present application;
fig. 2 is a schematic diagram of an intermodulation interference suppression circuit according to another embodiment of the present application;
the reference numbers are as follows: 1 is a switch tube, 2 is a band elimination filter, and 3 is a PCB (printed circuit board) line.
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 only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide an intermodulation interference suppression Circuit and an electronic device, and two band elimination filters with the function of filtering radio frequency signals are respectively arranged at the wiring positions of Printed Circuit boards (Printed Circuit boards, PCB for short) at two ends of a switch tube, so that the radio frequency signals entering the switch tube are filtered, and then the intermodulation interference is suppressed.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Intermodulation interference is generated by a nonlinear circuit in a transmission channel, when signals of two or more different frequencies are input to the nonlinear circuit, due to the action of the nonlinear device, many harmonics and combined frequency components are generated, wherein the combined frequency components close to the desired signal frequency can successfully pass through a receiver to form interference, and the interference is called intermodulation interference. Among the common non-linear devices are diodes, thyristors, etc.
Intermodulation interference is often generated in application scenarios such as communication, for example, in a microwave detection technology for detecting whether living bodies such as people or animals come in and go out in a certain area, when a rectifying circuit in a microwave sensor is close to a radio frequency circuit and reverse voltages received at two ends of a diode in the rectifying circuit are changed, a PN junction capacitance generated by the diode is changed, so that the diode becomes a nonlinear device, when a frequency signal transmitted by the sensor and a frequency signal generated by a mains supply simultaneously enter the diode, the nonlinear characteristic of the diode causes the generation of intermodulation interference, and further the normal operation of the sensor is directly influenced, so that the phenomena of missing report and false report occur. Therefore, it becomes important to reduce intermodulation interference in various application scenarios.
In order to suppress the generation of intermodulation interference, the application provides an intermodulation interference suppression circuit, which is characterized in that two band-stop filters are respectively arranged at the PCB wiring positions of two connecting ends of a switch tube so as to absorb radio-frequency signals generating intermodulation interference.
Fig. 1 is a schematic diagram of an intermodulation interference suppression circuit provided in an embodiment of the present application, and as shown in fig. 1, the intermodulation interference suppression circuit includes a switch tube 1 and a band-stop filter 2. The two band elimination filters 2 are respectively arranged at the PCB wiring 3 of the two connecting ends of the switch tube 1 and used for filtering the radio frequency signals which enter the switch tube 1 through the PCB and generate intermodulation interference.
It should be noted that the switch tube 1 may be a diode, a triode, a thyristor, or the like, that is, the intermodulation interference suppression circuit provided by the present application may be applied to any scenario where intermodulation interference is generated.
In practical applications, intermodulation interference is generated in many scenarios, and the essence of the intermodulation interference is that two signals with different frequencies enter a nonlinear device at the same time, for example, intermodulation interference is generated in the scenarios such as a microwave detection technology and a relay, and for facilitating understanding of the technical solution of the present application, the following will take the example of suppressing intermodulation interference received by a microwave sensor in the microwave detection technology as an example for detailed description.
In the microwave detection technology, a microwave sensor transmits radio frequency signals and receives signals reflected by a detected target, at the moment, the reflected signals and the radio frequency signals are processed by a mixer to obtain intermediate frequency signals, and the intermediate frequency signals are analyzed to determine that all the areas to be detected have living objects.
The microwave sensor comprises a rectifying circuit, when two ends of a diode in the rectifying circuit are subjected to reverse voltage, PN junction capacitance changes, and the diode becomes a nonlinear device.
Through the intermodulation interference suppression circuit that this application provided, walk line 3 punishment at the PCB at diode both ends and set up band elimination filter 2 respectively, band elimination filter 2 itself has the effect of absorption or reflection radio frequency signal Frf, from this, can restrain intermodulation interference's production through preventing radio frequency signal Frf to get into the diode.
It should be noted that, in order to further ensure the efficiency of suppressing the intermodulation interference, the band-stop filter 2 may be attached to the PBC trace. It should be further noted that the nature of the intermodulation interference is that two signals with different frequencies enter the nonlinear device at the same time, so the switch tube 1 in this application is a nonlinear device.
The intermodulation interference suppression circuit provided by the embodiment of the application comprises: the device comprises a switch tube and two band-stop filters, wherein the two band-stop filters are arranged at the PCB wiring positions of two connecting ends of the switch tube respectively and used for filtering radio-frequency signals generating intermodulation interference to suppress the intermodulation interference, the distance between the two band-stop filters is a preset value, and the preset value is set according to the radio-frequency signals generating the intermodulation interference. Therefore, according to the technical scheme provided by the application, the band elimination filters are respectively arranged at the PCB wiring positions at the two ends of the switch tube, the frequency signals generating the intermodulation interference are filtered by utilizing the performance of the band elimination filters, and the frequency signals are prevented from entering the switch tube to generate the intermodulation interference.
In a specific embodiment, the radio frequency signal Frf and the signal Fac generated by the utility power enter the switch tube through the PCB trace at the same time, which may generate intermodulation interference, and if the intermodulation interference is to be suppressed, it is only necessary to prevent the radio frequency signal Frf from entering the switch tube. Therefore, the circuit for suppressing intermodulation interference provided by the application sets the band elimination filter at the PCB wiring position of the two connecting ends of the switch tube, and the radio frequency signal Frf is reflected or absorbed by the band elimination filter, so that the generation of intermodulation interference is avoided. In order to further guarantee the efficiency of suppressing intermodulation interference, two band elimination filters are attached to be arranged on a PCB wiring. And further, the band-stop filter can be ensured to better absorb or reflect the radio frequency signal Frf.
It should be noted that whether the band-stop filter reflects the radio frequency signal Frf or absorbs the radio frequency signal Frf depends on the type and structure of the band-stop filter.
The intermodulation interference suppression circuit provided by the embodiment of the application sets up a band elimination filter respectively through the PCB line department at two link ends of the switch tube, utilizes the performance absorption or reflection of the band elimination filter to produce the frequency signal of intermodulation interference, and then avoids this frequency signal to get into the switch tube and produce intermodulation interference.
In specific implementation, the distance between the band elimination filters on the PCB traces at the two connecting ends of the switch tube is set according to the wavelength of the radio frequency signal Frf. The band-stop filters generate center frequency of the stop band, when the distance between the two band-stop filters is small, the effect of absorbing or reflecting the radio frequency signal Frf is affected, the distance between the two band-stop filters can be set according to the wavelength of the radio frequency signal Frf to achieve the best effect of filtering intermodulation interference, for example, the distance between the two band-stop filters is set to be one fourth of the wavelength of the radio frequency signal Frf, and the minimum distance cannot be less than one eighth. It should be noted that the setting of the spacing herein is only based on the value of the wavelength of the rf signal Frf.
It should be noted that when the center frequency of the stopband generated by the bandstop filter is the same as the radio frequency signal Frf, the effect of absorbing or reflecting the radio frequency signal Frf is the best, so that the stopband center frequency generated by the bandstop filter can be adjusted by setting bandstop filters with different lengths, and the effect of suppressing intermodulation interference is the best, and the length of the bandstop filter and the wavelength of the radio frequency signal Frf form a certain proportional relationship, so that the length of the bandstop filter can be adjusted according to the wavelength of the radio frequency signal Frf. For example, the length of the band-stop filter is one quarter of the wavelength of the radio frequency signal Frf.
The intermodulation interference suppression circuit provided by the embodiment of the application further suppresses the generation of intermodulation interference by adjusting the distance between the two band-stop filters and adjusting the length of the band-stop filters, and improves the effect of suppressing intermodulation interference.
In a specific embodiment, the radio frequency signal Frf enters the switch tube 1 through the PCB trace 3, which causes the generation of intermodulation interference, a parasitic LC resonant circuit may be generated by a package of the PN junction capacitor C of the switch tube 1 and a parasitic inductance generated by an external circuit, and the generated LC resonant circuit may receive the radio frequency signal Frf and transmit the received radio frequency signal Frf to the switch tube 1, so that when the radio frequency signal Frf and a frequency signal generated by a commercial power enter the nonlinear switch tube 1 at the same time, the intermodulation interference may be generated, and the band-stop filter 2 may not filter the intermodulation interference of the part. Fig. 2 is a schematic diagram of an intermodulation interference suppression circuit according to another embodiment of the present application, as shown in fig. 2, therefore, on the basis of the foregoing embodiment, the intermodulation interference suppression circuit according to the present application may further include a first inductor L1, a second inductor L2, and a capacitor C.
The first inductor L1 is connected with one end of the switch tube 1, the second inductor L2 is connected with the other end of the second switch tube 1, one end of the capacitor C is connected with the common end of the first inductor L1 and the switch tube 1, and the other end of the capacitor C is connected with the common end of the second inductor L2 and the second switch tube 1.
When a parasitic LC resonance circuit is generated by the parasitic inductance generated by the PN junction capacitor C of the switching tube 1, the package of the switching tube 1 and the external circuit, the center frequency of the LC resonance is:
wherein, L is the parasitic inductance generated by the package of the switch tube 1 and the external circuit, and C is the PN junction capacitance C of the switch tube 1.
If the intermodulation interference generated by the LC resonance center frequency is to be suppressed, the PN junction capacitance CC may be changed or the parasitic inductance L may be changed.
For example, when the junction capacitance C of the switching tube 1 is 1pF when it receives a reverse voltage of 200V, if the external parasitic inductance is 0.75 nanohenries (nh), the center frequency of the generated parasitic LC resonance is 5.8 GHz. That is to say, when the radio frequency signal Frf is 5.8GHz, the parasitic antenna, i.e., the LC resonant circuit, formed by the parasitic inductance and the PN junction capacitance C can receive and transmit the radio frequency signal Frf of 5.8GHz well, and transmit the signal to the PN junction of the switching tube 1, so that intermodulation interference is generated when the radio frequency signal Frf and the signal Fac generated by the commercial power enter the switching tube 1 at the same time.
If the PN junction capacitance CC is changed or the generated parasitic inductance L is changed, so that the generated parasitic LC resonance center frequency is 1.8GHz, the bandwidth of the generated parasitic antenna is large, and it is difficult to receive and transmit a signal with a frequency of 5.8GHz, thereby preventing the radio frequency signal Frf and the signal Fac generated by the mains supply from entering the switching tube 1 at the same time. That is to say, a parasitic antenna structure capable of receiving the radio frequency signal Frf is prevented from being formed by the PN junction capacitance C of the switching tube 1 and the external parasitic inductance, that is, after the capability of the parasitic antenna for receiving the Frf signal is damaged, the radio frequency signal Frf entering the switching tube 1 can be reduced, so that the intensity of intermodulation interference is reduced.
Therefore, the intermodulation interference suppression circuit provided by the application is additionally provided with the first inductor L1, the second inductor L2 and the capacitor C, the resonance center frequency of the generated parasitic LC is changed, and intermodulation interference is further reduced.
The intermodulation interference suppression circuit provided by the embodiment of the application reduces the generated parasitic LC resonance center frequency by additionally arranging the first inductor, the second inductor and the capacitor, reduces the loan for destroying the parasitic antenna so as to reduce the capability of receiving Frf signals, and further reduces the radio frequency signal Frf entering the switching tube, thereby reducing the intensity of intermodulation interference.
In a specific embodiment, the band-stop filter may be a coupled microstrip wave trap or a parallel-base microstrip wave trap. When radio frequency signal walked the line transmission to the switch tube along PCB and produced intermodulation interference, can use discrete inductance capacitance to build filter circuit, by this filter circuit to intermodulation interference filter, but under some application scenarios, for example, under the rectifier diode scene, the commercial power voltage after the electric capacity needs can bear the rectification, withstand voltage needs height reach more than 400V to the self-resonant frequency of requirement electric capacity and inductance all need be greater than radio frequency signal Frf, and then can lead to the device cost very high, and the circuit is bulky.
The microstrip line band-stop filter or the microstrip low-pass filter, namely the coupling type microstrip wave trap or the parallel base type microstrip wave trap, is low in cost and strong in intermodulation interference filtering, and the microstrip line band-stop filter is relatively simple in structure, small in circuit area and free of occupying a large amount of PCB (printed circuit board) area.
The radio frequency signal Frf transmitted to the switch tube through the PCB wiring can be reflected or directly absorbed by the band elimination filter, and the radio frequency signal Frf entering the switch tube is greatly reduced, so that the intensity of intermodulation interference is reduced. It should be noted that the original reflection or direct absorption of the band-stop filter depends on the structure of the band-stop filter used.
The intermodulation interference suppression circuit provided by the embodiment of the application is characterized in that the PCB wiring parts at the two ends of the switch tube are respectively provided with the band elimination filter, and the performance of the band elimination filter is utilized to filter the frequency signal generating the intermodulation interference, so that the frequency signal is prevented from entering the switch tube to generate the intermodulation interference.
In a specific embodiment, the switching tube may be a diode, a triode, a thyristor, or the like, which may change a PN junction capacitance when subjected to a reverse voltage, so that the diode, the triode, and the thyristor become elements of a nonlinear device.
It should be noted that the intermodulation interference suppression circuit provided by the present application can be applied to many scenarios generating intermodulation interference, and since the nature of generating intermodulation interference is signals of different frequencies, such as nonlinear devices, the switch tube in the present application is necessarily a nonlinear device.
The intermodulation interference suppression circuit provided by the embodiment of the application is characterized in that the PCB wiring parts at the two ends of the switch tube are respectively provided with the band elimination filter, and the performance of the band elimination filter is utilized to filter the frequency signals generating the intermodulation interference, so that the intermodulation interference generated by all nonlinear devices can be suppressed.
On the basis of the above embodiment, the intermodulation interference suppression circuit provided by the present application may further include a frequency signal detection unit and an alarm device, the frequency signal detection unit is connected to the switch tube for collecting the frequency signal entering the switch tube, and the alarm device is connected to the frequency signal detection unit for sending an alarm signal when the frequency signal collected by the frequency signal detection unit satisfies the preset condition.
The preset condition may be set by the user, for example, when the frequency signal collected by the unit reaches a threshold value set by the user in advance, it indicates that the intermodulation interference is too large, and at this time, an alarm signal is sent to prompt the user to adjust the frequency signal, so as to avoid the influence of the intermodulation interference.
The intermodulation interference suppression circuit provided by the embodiment of the application is additionally provided with the frequency signal detection unit and the alarm device, and when the radio-frequency signal detected by the radio-frequency signal detection unit meets the preset condition, the alarm device is controlled to send out the alarm signal, so that a user is reminded of paying attention to the influence of intermodulation interference.
In the above embodiments, the intermodulation interference suppression circuit has been described in detail, and the present application also provides an electronic device including an electronic device body, and further including the intermodulation interference suppression circuit described in the above embodiments.
It should be noted that the electronic device may be a microwave sensor, a relay, or any electronic device that may generate intermodulation interference, and the present application is not limited thereto.
The application provides an electronic device, including intermodulation interference suppression circuit, wherein, intermodulation interference suppression circuit includes switch tube and band elimination filter, and the band elimination filter is two, and two band elimination filters set up respectively in the PCB of two link ends of switch tube and walk line department for the radio frequency signal that the filtering produced intermodulation interference is in order to restrain intermodulation interference, and wherein, the interval between two band elimination filters is the default, and this default sets for according to the radio frequency signal that produces intermodulation interference. Therefore, according to the technical scheme provided by the application, the band elimination filters are respectively arranged at the PCB wiring positions at the two ends of the switch tube, the frequency signals generating the intermodulation interference are filtered by utilizing the performance of the band elimination filters, and the frequency signals are prevented from entering the switch tube to generate the intermodulation interference.
The intermodulation interference suppression circuit and the electronic device provided by the present application are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An intermodulation interference suppression circuit, comprising: a switch tube and a band elimination filter;
the two band-stop filters are respectively arranged at the PCB wiring positions of the two connecting ends of the switch tube, and the distance between the two band-stop filters is a preset value and is used for filtering radio-frequency signals generating intermodulation interference so as to inhibit the intermodulation interference; wherein the preset value is set according to the wavelength of the radio frequency signal.
2. The intermodulation interference suppression circuit of claim 1, wherein each band-stop filter is attached to the PCB line.
3. The intermodulation interference suppression circuit of claim 2, wherein the length of each band-stop filter is set according to the wavelength of the radio frequency signal.
4. The intermodulation interference suppression circuit of claim 3, further comprising a first inductor and a second inductor;
the first inductor is connected with one end of the switch tube, and the second inductor is connected with the other end of the switch tube.
5. The intermodulation interference suppression circuit of claim 4, further comprising a capacitor;
one end of the capacitor is connected with the common end of the first inductor and the switch tube, and the other end of the capacitor is connected with the common end of the second inductor and the switch tube.
6. The intermodulation interference suppression circuit of claim 1, wherein the band-stop filter is a coupled microstrip trap.
7. The intermodulation interference suppression circuit according to any of claims 1-5, wherein the switching tubes are diodes.
8. The intermodulation interference suppression circuit of claim 1, further comprising a frequency signal detection unit and an alarm device;
the frequency signal detection unit is connected with the switching tube and is used for collecting the frequency signal entering the switching tube;
the alarm device is connected with the frequency signal detection unit and used for sending out an alarm signal when the frequency signal acquired by the frequency signal detection unit meets a preset condition.
9. An electronic device comprising an electronic device body, characterized in that it further comprises an intermodulation interference suppression circuit as claimed in any of claims 1 to 8.
10. The electronic device of claim 9, wherein the electronic device body is a microwave sensor or a relay.
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| CN202210129823.9A CN114337705A (en) | 2022-02-11 | 2022-02-11 | Intermodulation interference suppression circuit and electronic device |
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| CN202210129823.9A CN114337705A (en) | 2022-02-11 | 2022-02-11 | Intermodulation interference suppression circuit and electronic device |
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2022
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| US4968959A (en) * | 1988-09-22 | 1990-11-06 | Alcatel N.V. | Microwave frequency divider |
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