Automatic gain control device and electronic equipment

Abstract

The utility model discloses an automatic gain control device and electronic equipment, and belongs to the technical field of power electronics. The automatic gain control device comprises an antenna module used for receiving a wireless signal; and the gain adjustment module is connected with the antenna module, and the gain adjustment module is used for adjusting the output of the gain adjustment module according to the signal strength of the wireless signal. According to the antenna system, the gain adjusting module is designed in the radio frequency link of the antenna system, so that the signal strength of the radio frequency signal output by the antenna can be automatically adjusted, the circuit is ensured not to be distorted when the signal interference is relatively large, and the signal has enough amplification capability when the signal interference is relatively weak or no interference exists. According to the invention, it can be ensured that the radio-frequency signal input to the rear-end digital sampling chip by the antenna is kept in a proper working range.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to an automatic gain control device and an electronic device. Background Art

[0002] With the deployment of BeiDou II, BeiDou III, and GPS (Global Positioning System) navigation systems for many years, the application of anti-interference antennas has increased day by day, and the requirements for anti-interference performance have become increasingly higher. Now the anti-interference performance requirements of high-performance anti-interference antennas are usually above 100dB signal-to-noise ratio, which puts forward very high requirements on circuit hardware, not only to ensure that the circuit is not distorted in the case of large interference, but also to ensure that the signal has sufficient amplification capability in the case of weak interference or no interference. At present, in antenna systems, usually only the digital sampling link is anti-interference processed, and the RF link is not anti-interference processed. The anti-interference capability of this anti-interference method is insufficient. Utility Model Content

[0003] The main purpose of this application is to provide an automatic gain control device and an electronic device, aiming to solve the technical problem of how to perform anti-interference processing in the radio frequency link of the antenna system, thereby improving the anti-interference ability of the antenna system.

[0004] To achieve the above-mentioned object, the present application provides an automatic gain control device, the automatic gain control device comprising: an antenna module, the antenna module being used to receive a wireless signal;

[0005] A gain adjustment module, the gain adjustment module is connected to the antenna module, and the gain adjustment module is used to adjust the output of the gain adjustment module according to the signal strength of the wireless signal.

[0006] Optionally, the gain adjustment module includes:

[0007] An output unit, an input end of which is connected to the antenna module, and the output unit is used to output a low noise amplifier signal according to the wireless signal;

[0008] A feedback unit, wherein the input end of the feedback unit is connected to the output end of the output unit, the output end of the feedback unit is connected to the feedback end of the output unit, and the feedback unit is used to output a feedback signal according to the low noise amplifier signal.

[0009] Optionally, the output unit includes:

[0010] a first amplifier circuit, wherein an input end of the first amplifier circuit serves as an input end of the output unit and is connected to the antenna module, and the first amplifier circuit is used to output a first amplified signal according to the wireless signal;

[0011] An automatic gain control circuit, wherein an input end of the automatic gain control circuit is connected to the first amplifying circuit, a feedback end of the automatic gain control circuit is connected to an output end of the feedback unit, the automatic gain control circuit is used to output a gain signal according to the first amplified signal, and the automatic gain control circuit is also used to adjust the gain signal according to the feedback signal;

[0012] A second amplifier circuit, wherein the input end of the second amplifier circuit is connected to the output end of the automatic gain control circuit, the output end of the second amplifier circuit serves as the output end of the output unit and is connected to the input end of the feedback unit, and the second amplifier circuit is used to output the low noise amplifier signal according to the gain signal.

[0013] Optionally, the feedback unit includes:

[0014] a signal coupling circuit, wherein an input end of the signal coupling circuit is connected to an output end of the second amplifying circuit, and the signal coupling circuit is used to output a coupling signal according to the low noise amplifier signal;

[0015] a third amplifier circuit, wherein an input end of the third amplifier circuit is connected to an output end of the signal coupling circuit, and the third amplifier circuit is used to output a second amplified signal according to the coupling signal;

[0016] a detection circuit, wherein an input end of the detection circuit is connected to an output end of the third amplifier circuit, and the detection circuit is used to convert the second amplified signal into a DC signal;

[0017] An integrating amplifier circuit, wherein the input end of the integrating amplifier circuit is connected to the output end of the detection circuit, the output end of the integrating amplifier circuit is connected to the feedback end of the automatic gain control circuit, and the integrating amplifier circuit is used to output a feedback signal according to the DC signal.

[0018] Optionally, when the signal strength of the low noise amplifier signal is lower than a preset threshold range, the signal coupling circuit outputs a first coupling signal, the first coupling signal is converted into a first DC signal through the third amplifier circuit and the detection circuit, the integral amplifier circuit outputs a first feedback signal according to the first DC signal, and the automatic gain control circuit outputs a first gain signal according to the first feedback signal;

[0019] When the signal strength of the low noise amplifier signal is higher than the preset threshold range, the signal coupling circuit outputs a second coupling signal, the second coupling signal is converted into a second DC signal through the third amplifier circuit and the detection circuit, the integral amplifier circuit outputs a second feedback signal according to the second DC signal, and the automatic gain control circuit outputs a second gain signal according to the second feedback signal.

[0020] Optionally, the automatic gain control circuit includes an electrically adjustable attenuator.

[0021] Optionally, the signal coupling circuit comprises a directional coupler, and the directional coupler is used to couple the low noise amplifier signal.

[0022] Optionally, the first amplifying circuit, the second amplifying circuit and the third amplifying circuit include low noise amplifiers.

[0023] Optionally, the gain adjustment module is arranged on the back side of the antenna module.

[0024] In addition, to achieve the above-mentioned purpose, the present application also provides an electronic device, which includes the automatic gain control device as described above.

[0025] The present application proposes an automatic gain control device and an electronic device, the automatic gain control device comprising: an antenna module, the antenna module is used to receive wireless signals; a gain adjustment module, the gain adjustment module is connected to the antenna module, and the gain adjustment module is used to adjust the output of the gain adjustment module according to the signal strength of the wireless signal. The present application is designed in the radio frequency link of the antenna system, and the gain adjustment module is used to adjust the signal transmitted from the antenna module, so as to ensure that the circuit is not distorted when the signal is subject to relatively large interference, and when the signal is subject to weak or no interference, the signal has sufficient amplification capability, so that the antenna system can realize the anti-interference function in the radio frequency link, and then cooperate with the anti-interference processing of the digital sampling link, which greatly improves the anti-interference ability of the antenna system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the structure of an automatic gain control device provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a gain adjustment module in an automatic gain control device provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of an output unit in an automatic gain control device provided in an embodiment of the present application;

[0030] Figure 4A schematic diagram of the structure of a feedback unit in an automatic gain control device provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0032] Description of Figure Numbers:

[0033] Label name Label name 10 Antenna module 20 Gain adjustment module 21 Output unit 22 Feedback unit 211 The first amplifier circuit 221 Signal coupling circuit 212 Automatic gain control circuit 222 The third amplifier circuit 213 The second amplifier circuit 223 Detection circuit 01 Electronic devices 224 Integral amplifier circuit 02 Automatic gain control device

[0034] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the meaning of "and / or" appearing in the full text is to include three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B.

[0038] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0040] With the deployment of BeiDou II, BeiDou III, and GPS navigation systems over the years, the application of anti-interference antennas has increased, and the requirements for anti-interference performance have become increasingly higher. Now, the anti-interference performance requirements of high-performance anti-interference antennas are usually above 100dB signal-to-noise ratio, which places high demands on circuit hardware, ensuring that the circuit is not distorted in the event of large interference, and that the signal has sufficient amplification capability in the event of weak or no interference. At present, in antenna systems, anti-interference is usually only performed on the digital sampling link, but not on the RF link. The anti-interference capability of this anti-interference method is insufficient.

[0041] Based on this, the present application proposes an automatic gain control device and an electronic device, the automatic gain control device comprising: an antenna module, the antenna module is used to receive wireless signals; a gain adjustment module, the gain adjustment module is connected to the antenna module, and the gain adjustment module is used to adjust the output of the gain adjustment module according to the signal strength of the wireless signal. The present application is designed in the radio frequency link of the antenna system, and the gain adjustment module is used to adjust the signal transmitted from the antenna module, so as to ensure that the circuit is not distorted when the signal is subject to large interference, and when the signal is subject to weak interference or no interference, the signal has sufficient amplification capability, so that the antenna system can realize the anti-interference function in the radio frequency link, and then cooperate with the anti-interference processing of the digital sampling link, which greatly improves the anti-interference ability of the antenna system.

[0042] The present application embodiment provides an automatic gain control device, referring to Figure 1 , Figure 1 A schematic diagram of the structure of an automatic gain control device provided in one embodiment of the present application, the automatic gain control device comprising:

[0043] An antenna module 10, wherein the antenna module 10 is used to receive wireless signals;

[0044] A gain adjustment module 20 , wherein the gain adjustment module 20 is connected to the antenna module 10 , and the gain adjustment module 20 is used to adjust the output of the gain adjustment module 20 according to the signal strength of the wireless signal.

[0045] In this embodiment, the automatic gain control device can be used in a satellite navigation system, and a digital sampling chip is connected to the back end of the device. The automatic gain control device has a strong anti-interference ability, and the signal strength output by the device is within a normal working range by adjusting the gain.

[0046] The automatic gain control device includes an antenna module 10 and a gain adjustment module 20. The antenna module 10 is an antenna array element composed of multiple antennas, which can be used to receive or transmit radio signals. Each antenna in the array element can independently receive or transmit signals, so the antenna array element can achieve different signal processing functions by changing the relative position and phase of each antenna; the input end of the gain adjustment module 20 is connected to the output end of the antenna module 10. In this embodiment, the gain adjustment module 20 is used to adjust the output signal of the gain adjustment module 20 according to the signal strength of the wireless signal received by the antenna module 10 to achieve anti-interference.

[0047] From the perspective of the various components of the above-mentioned automatic gain control device, the antenna module 10 is used to receive wireless signals; the gain adjustment module 20 is used to adjust the gain of the signal output by itself according to the signal strength of the wireless signal, which is equivalent to increasing the signal strength of the input signal so that the signal strength of the output signal can be higher. When the signal strength of the wireless signal is weak, the gain adjustment module 20 increases the output gain and outputs a signal with a stronger signal strength; when the signal strength of the wireless signal is strong, the gain adjustment module 20 reduces the output gain and outputs a signal with a weaker signal strength. In the case of large interference, the automatic gain control device can reduce the output gain and effectively resist interference. In the case of small interference or no interference, the automatic gain control device can increase the output gain so that the signal strength of the output signal can be within a suitable range. In this way, the anti-interference function of the RF link of the antenna system can be realized, and the signal input to the back-end digital sampling chip can be kept within a suitable working range.

[0048] Reference Figure 2 In some feasible embodiments, the gain adjustment module includes 20:

[0049] An output unit 21, an input end of the output unit 21 is connected to the antenna module 10, and the output unit 21 is used to output a low noise amplifier signal according to the wireless signal;

[0050] A feedback unit 22, wherein the input end of the feedback unit 22 is connected to the output end of the output unit 21, the output end of the feedback unit 22 is connected to the feedback end of the output unit 21, and the feedback unit 22 is used to output a feedback signal according to the low noise amplifier signal.

[0051] In this embodiment, the gain adjustment module 20 includes an output unit 21 and a feedback unit 22. The output unit 21 is used to output a low noise amplifier signal. When it receives the wireless signal received and transmitted by the antenna module 10, it processes the wireless signal and outputs a low noise amplifier signal. Among them, the low noise amplifier signal refers to a signal after the input signal is amplified while minimizing the noise in the signal. The feedback unit 22 is connected between the signal output end and the output unit 21 to form a feedback loop. The feedback unit 22 can output a feedback signal to the output unit 21 according to the output low noise amplifier signal, and the output unit 21 adjusts the signal strength of the low noise amplifier signal according to the feedback signal.

[0052] Reference Figure 3 In some feasible embodiments, the output unit 21 includes:

[0053] A first amplifier circuit 211, wherein an input end of the first amplifier circuit 211 is used as an input end of the output unit 21 and is connected to the antenna module 10, and the first amplifier circuit 211 is used to output a first amplified signal according to the wireless signal;

[0054] An automatic gain control circuit 212, wherein an input end of the automatic gain control circuit 212 is connected to the first amplifying circuit 211, a feedback end of the automatic gain control circuit 212 is connected to an output end of the feedback unit 22, the automatic gain control circuit 212 is used to output a gain signal according to the first amplified signal, and the automatic gain control circuit 212 is also used to adjust the gain signal according to the feedback signal;

[0055] A second amplifier circuit 213, wherein the input end of the second amplifier circuit 213 is connected to the output end of the automatic gain control circuit 212, the output end of the second amplifier circuit 213 serves as the output end of the output unit 21, and is connected to the input end of the feedback unit 22, and the second amplifier circuit 213 is used to output the low noise amplifier signal according to the gain signal.

[0056] In this embodiment, the output unit 21 includes a first amplifier circuit 211, an automatic gain control circuit 212 and a second amplifier circuit 211. The input end of the first amplifier circuit 211 is connected to the antenna module 10. When the wireless signal transmitted by the antenna enters the first amplifier circuit 211, the first amplifier circuit 211 performs low-noise amplification processing on the wireless signal to obtain a first amplified signal; the first amplified signal is input to the automatic gain control circuit 212 for gain control to obtain a gain signal, wherein the automatic gain control circuit 212 is an AGC (Automatic Gain Control) circuit, and the gain control can be to multiply the first amplified signal by a gain coefficient; the gain signal is then low-noise amplified by the second amplifier circuit 213 to obtain a low-noise amplified signal output. The key point of the low-noise amplification processing of the first amplifier circuit 211 and the second amplifier circuit 213 is to minimize the noise in the signal while amplifying the input signal. Therefore, in terms of circuit design, it only needs to have a high gain coefficient and a low noise coefficient.

[0057] Reference Figure 4 In some feasible embodiments, the feedback unit 22 includes:

[0058] A signal coupling circuit 221, wherein an input end of the signal coupling circuit 221 is connected to an output end of the second amplifying circuit 213, and the signal coupling circuit 221 is used to output a coupling signal according to the low noise amplifier signal;

[0059] A third amplifier circuit 222, wherein an input end of the third amplifier circuit 222 is connected to an output end of the signal coupling circuit 221, and the third amplifier circuit 222 is used to output a second amplified signal according to the coupling signal;

[0060] A detection circuit 223, wherein an input end of the detection circuit 223 is connected to an output end of the third amplifier circuit 222, and the detection circuit 223 is used to convert the second amplified signal into a DC signal;

[0061] An integral amplifier circuit 224, wherein the input end of the integral amplifier circuit 224 is connected to the output end of the detection circuit 223, the output end of the integral amplifier circuit 224 is connected to the feedback end of the automatic gain control circuit 212, and the integral amplifier circuit 224 is used to output a feedback signal according to the DC signal.

[0062] In this embodiment, the feedback unit 22 includes a signal coupling circuit 221, a third amplifier circuit 222, a detection circuit 223 and an integral amplifier circuit 224. The input end of the signal coupling circuit 221 is connected to the output end of the second amplifier circuit 213. The signal coupling circuit 221 couples the low noise amplifier signal and then outputs the coupled signal to the third amplifier circuit 222. The third amplifier circuit 222 performs low noise amplification processing on the coupled signal and outputs the second amplified signal. The third amplifier circuit 222 can be the same as the first amplifier circuit 211 and the second amplifier circuit 213 in circuit design; the detection circuit 223 converts the second amplified signal into a DC signal. The second amplified signal is a radio frequency signal. In order to facilitate the automatic gain control circuit 212 to identify the feedback signal, the radio frequency signal needs to be converted into a DC signal; the integral amplifier circuit 224 receives the DC signal and outputs a stable feedback signal. The feedback signal is actually a DC signal, but the feedback signal is more stable, which facilitates the automatic gain control circuit 211 to identify the feedback signal.

[0063] In some feasible embodiments, when the signal strength of the low noise amplifier signal is lower than a preset threshold range, the signal coupling circuit 221 outputs a first coupling signal, the first coupling signal is converted into a first DC signal through the third amplifier circuit 222 and the detection circuit 223, the integral amplifier circuit 224 outputs a first feedback signal according to the first DC signal, and the automatic gain control circuit 212 outputs a first gain signal according to the first feedback signal;

[0064] When the signal strength of the low noise amplifier signal is higher than the preset threshold range, the signal coupling circuit 221 outputs a second coupling signal, the second coupling signal is converted into a second DC signal through the third amplifier circuit 222 and the detection circuit 223, the integral amplifier circuit 224 outputs a second feedback signal according to the second DC signal, and the automatic gain control circuit 212 outputs a second gain signal according to the second feedback signal.

[0065] In this embodiment, when the signal strength of the wireless signal received by the antenna module is weak, the signal strength of the low noise amplifier signal will also be relatively weak, and the signal strength of the signal coupling circuit 221 coupling the low noise amplifier signal to the signal on the feedback loop will also be relatively weak. That is, the signal strengths of the coupling signal, the second amplified signal, the DC signal and the feedback signal are all relatively low, wherein the DC signal and the feedback signal can specifically be voltage signals. In this case, the feedback end of the automatic gain control circuit 212 receives a low voltage signal, and the automatic gain control circuit 212 increases the output gain according to the low voltage signal, and finally the signal strength of the low noise amplifier signal output by the second amplifier circuit 213 is increased to within the preset threshold range, and the preset threshold range can be set according to actual needs, for example, 100dB to 200dB. When the signal strength of the wireless signal received by the antenna module is strong, the signal strength of the low noise amplifier signal will also be relatively strong, and the signal coupling circuit 221 coupling the low noise amplifier signal to the signal on the feedback loop will also be relatively strong. That is, the signal strengths of the coupling signal, the second amplified signal, the DC signal and the feedback signal are all relatively strong. In this case, the feedback end of the automatic gain control circuit 212 receives a high voltage signal, and the automatic gain control circuit 212 reduces the output gain according to the high voltage signal, and finally reduces the signal strength of the low noise amplifier signal output by the second amplifier circuit 213 to within the preset threshold range. The high voltage signal and the low voltage signal mentioned in this embodiment are defined relative to the automatic gain control circuit 212. When the automatic gain control circuit 212 increases the output gain according to a signal, the signal is a low voltage signal; when the automatic gain control circuit 212 reduces the output gain according to a signal, the signal is a high voltage signal. The specific voltage value varies according to different circuit designs of the automatic gain control circuit 212.

[0066] In some feasible embodiments, the automatic gain control circuit 212 includes an electrically adjustable attenuator.

[0067] In this embodiment, the electrically adjustable attenuator can be used to form the automatic gain control circuit 212. In the automatic gain control circuit 212, the electrically adjustable attenuator is usually used for variable gain control. When the amplitude of the output signal exceeds a preset range, the electrically adjustable attenuator will reduce the gain of the amplifier, thereby reducing the amplitude of the output signal. On the contrary, when the amplitude of the output signal is lower than the preset range, the electrically adjustable attenuator will increase the gain of the amplifier to increase the amplitude of the output signal. The electrically adjustable attenuator can be replaced by a variable gain amplifier as long as it can form the automatic gain control circuit 212.

[0068] In some feasible embodiments, the signal coupling circuit 221 includes a directional coupler, and the directional coupler is used to couple the low noise amplifier signal.

[0069] In this embodiment, the directional coupler is used to couple the low noise amplifier signal to the feedback loop, and the model of the directional coupler may be PE2203-30. The signal coupling circuit 221 may also include a coupling transformer, etc., as long as it can be used for high frequency circuit coupling and can work safely.

[0070] In some feasible embodiments, the first amplifying circuit 211 , the second amplifying circuit 213 , and the third amplifying circuit 222 include low noise amplifiers.

[0071] In this embodiment, the low noise amplifier is an electronic amplifier used to amplify weak signals and minimize noise. It is mainly used in the fields of wireless communication, radar, satellite communication, etc., and is used to improve the sensitivity and reliability of the receiving system to weak signals. The key feature of the low noise amplifier is to minimize the noise in the signal while amplifying the input signal. Since the power of the received signal is very weak in many applications, the effect of noise on the signal is very significant. Therefore, the low noise amplifier is designed as an amplifier with high gain and low noise factor.

[0072] In some feasible embodiments, the gain adjustment module is disposed on the back side of the antenna module.

[0073] In this embodiment, the gain adjustment module 20 is disposed on the back of the antenna module 10, avoiding the use of transmission cables, saving costs, reducing the occupied space, and being helpful in preventing noise.

[0074] This embodiment provides an automatic gain control device. In order to realize that the radio frequency link of the antenna system also has anti-interference ability, this embodiment introduces an automatic gain control circuit. The automatic gain control circuit can automatically increase or decrease the output gain according to the feedback signal, and cooperate with the individual circuits on the feedback loop. When the input signal of the antenna system is subject to large interference, the automatic gain control circuit reduces the output gain according to the feedback signal on the feedback loop, so that the circuit of the antenna system is not distorted; when the input signal of the antenna system is subject to weak or no interference, the automatic gain control circuit increases the output gain according to the feedback signal on the feedback loop, so that the signal has sufficient amplification ability. This embodiment introduces an automatic gain control circuit, so that the antenna system realizes the anti-interference function in the radio frequency link, and cooperates with the anti-interference processing of the digital sampling link, which greatly improves the anti-interference ability of the antenna system.

[0075] In addition, the present application embodiment also provides an electronic device 01, referring to Figure 5 The electronic device 01 includes the automatic gain control device 02 provided in the above embodiment.

[0076] Since the electronic device proposed in this embodiment includes the automatic gain control device proposed in the above embodiments, it has the beneficial effects of the above embodiments. For details of the specific working process and principle of the automatic gain control device, please refer to the automatic gain control devices provided in the above embodiments, which will not be described one by one here, and all are within the protection scope of this embodiment.

[0077] It should be noted that the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the fact that they can be implemented by technical personnel in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0078] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An automatic gain control device, characterized in that: The automatic gain control device comprises: An antenna module, wherein the antenna module is used to receive wireless signals; A gain adjustment module, the gain adjustment module is connected to the antenna module, and the gain adjustment module is used to adjust the output of the gain adjustment module according to the signal strength of the wireless signal.

2. The automatic gain control device according to claim 1, characterized in that: The gain adjustment module comprises: An output unit, an input end of which is connected to the antenna module, and the output unit is used to output a low noise amplifier signal according to the wireless signal; A feedback unit, wherein the input end of the feedback unit is connected to the output end of the output unit, the output end of the feedback unit is connected to the feedback end of the output unit, and the feedback unit is used to output a feedback signal according to the low noise amplifier signal.

3. The automatic gain control device according to claim 2, characterized in that: The output unit comprises: a first amplifier circuit, wherein an input end of the first amplifier circuit serves as an input end of the output unit and is connected to the antenna module, and the first amplifier circuit is used to output a first amplified signal according to the wireless signal; An automatic gain control circuit, wherein an input end of the automatic gain control circuit is connected to the first amplifying circuit, a feedback end of the automatic gain control circuit is connected to an output end of the feedback unit, the automatic gain control circuit is used to output a gain signal according to the first amplified signal, and the automatic gain control circuit is also used to adjust the gain signal according to the feedback signal; A second amplifier circuit, wherein the input end of the second amplifier circuit is connected to the output end of the automatic gain control circuit, the output end of the second amplifier circuit serves as the output end of the output unit and is connected to the input end of the feedback unit, and the second amplifier circuit is used to output the low noise amplifier signal according to the gain signal.

4. The automatic gain control device according to claim 3, characterized in that: The feedback unit comprises: a signal coupling circuit, wherein an input end of the signal coupling circuit is connected to an output end of the second amplifying circuit, and the signal coupling circuit is used to output a coupling signal according to the low noise amplifier signal; a third amplifier circuit, wherein an input end of the third amplifier circuit is connected to an output end of the signal coupling circuit, and the third amplifier circuit is used to output a second amplified signal according to the coupling signal; a detection circuit, wherein an input end of the detection circuit is connected to an output end of the third amplifier circuit, and the detection circuit is used to convert the second amplified signal into a DC signal; An integrating amplifier circuit, wherein the input end of the integrating amplifier circuit is connected to the output end of the detection circuit, the output end of the integrating amplifier circuit is connected to the feedback end of the automatic gain control circuit, and the integrating amplifier circuit is used to output a feedback signal according to the DC signal.

5. The automatic gain control device according to claim 4, characterized in that: When the signal strength of the low noise amplifier signal is lower than a preset threshold range, the signal coupling circuit outputs a first coupling signal, the first coupling signal is converted into a first DC signal through the third amplifier circuit and the detection circuit, the integral amplifier circuit outputs a first feedback signal according to the first DC signal, and the automatic gain control circuit outputs a first gain signal according to the first feedback signal; When the signal strength of the low noise amplifier signal is higher than the preset threshold range, the signal coupling circuit outputs a second coupling signal, the second coupling signal is converted into a second DC signal through the third amplifier circuit and the detection circuit, the integral amplifier circuit outputs a second feedback signal according to the second DC signal, and the automatic gain control circuit outputs a second gain signal according to the second feedback signal.

6. The automatic gain control device according to claim 3, characterized in that: The automatic gain control circuit includes an electrically adjustable attenuator.

7. The automatic gain control device according to claim 4, characterized in that: The signal coupling circuit includes a directional coupler, and the directional coupler is used to couple the low noise amplifier signal.

8. The automatic gain control device according to claim 4, characterized in that: The first amplifying circuit, the second amplifying circuit, and the third amplifying circuit include low noise amplifiers.

9. The automatic gain control device according to claim 1, characterized in that: The gain adjustment module is arranged on the back side of the antenna module.

10. An electronic device, characterized in that: The electronic device comprises the automatic gain control device according to any one of claims 1 to 9.

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