Anti-interference signal stable transmission circuit based on adaptive gain amplifier

Abstract

The invention discloses an anti-interference signal stable transmission circuit based on an adaptive gain amplifier, and the circuit comprises a first amplification unit which inputs a to-be-processed signal and a first adjustment signal in a common-mode manner, so as to output a first amplification signal; the filtering unit is used for inputting the first amplification signal in a differential mode form so as to output a filtering signal; the second amplifying unit inputs the filtering signal and the second adjusting signal in a common mode form so as to output a second amplifying signal; the feedback unit inputs a to-be-processed signal and a filtering signal in a common-mode form so as to adjust the gain coefficient of the first amplification unit; and the coupling unit is used for adjusting the gain coefficient of the second amplification unit based on the first adjusting signal. Therefore, a front-stage and back-stage amplification gain cooperative adjustment mechanism can be constructed, the overall gain is stable, gain adjustment can adapt to the characteristics of signals after amplification and filtering, and the consistency of signal transmission is guaranteed while the signal strength is dynamically adapted and interference is suppressed.

Description

Technical Field

[0001] This invention relates to the field of amplifier technology, specifically to an anti-interference signal stable transmission circuit based on an adaptive gain amplifier. Background Technology

[0002] In signal transmission scenarios in fields such as electronic communication and industrial control, adaptive gain amplifiers are core components that ensure signal adaptability because they can dynamically adjust the amplification factor according to the input signal strength. Their core application requirement is to achieve stable signal amplification and anti-interference transmission to adapt to practical problems such as signal strength fluctuations and noise interference in complex environments.

[0003] Currently, existing signal transmission circuits based on adaptive gain amplifiers in the industry typically include processes such as amplification, filtering, and feedback. The amplitude of the amplified signal is adjusted to filter out some noise, and the feedback is used to initially adjust the amplification gain to meet basic signal processing requirements.

[0004] Although the design of such circuits revolves around basic logic such as signal amplification, interference filtering, and simple feedback, enabling preliminary processing of conventional signals, their multi-stage amplification units lack a coordinated gain adjustment mechanism. Specifically, the gain adjustment of the preceding stage amplification is not effectively linked to the gain change of the subsequent stage amplification, and the feedback adjustment is not specifically designed to address the characteristics of the amplified and filtered signal. Furthermore, the input method for filtering is not adapted to the characteristics of the amplified signal. This core problem prevents the circuit from maintaining overall gain stability while dynamically adjusting the gain of individual stages to adapt to signal strength or suppress interference. Consequently, it affects the consistency of signal transmission and anti-interference performance, making it difficult to meet the high-precision requirements for stable signal transmission in complex scenarios. Summary of the Invention

[0005] The present invention aims to at least partially solve the technical problems in the above-mentioned technologies.

[0006] Therefore, this invention discloses an anti-interference signal stable transmission circuit based on an adaptive gain amplifier, comprising: The first amplification unit receives the signal to be processed and the first adjustment signal in common mode and outputs the first amplified signal. A filtering unit receives the first amplified signal in differential mode and outputs a filtered signal. The second amplification unit receives the filtered signal and the second adjustment signal in common-mode mode to output the second amplified signal. A feedback unit, which receives the signal to be processed and the filtered signal in common mode to adjust the gain coefficient of the first amplification unit; A coupling unit that adjusts the gain coefficient of the second amplification unit based on the first adjustment signal.

[0007] The anti-interference signal stable transmission circuit based on an adaptive gain amplifier disclosed in this invention has at least the following beneficial effects: (1) The gain of the second amplification unit is adjusted by the coupling unit based on the first adjustment signal, and the gain of the first amplification unit is adjusted by the feedback unit to build a coordinated adjustment mechanism of the amplification gain of the front and rear stages, so as to stabilize the overall gain; (2) The feedback unit inputs the signal to be processed and the filtered signal in common mode so that the gain adjustment can be adapted to the characteristics of the signal after amplification and filtering; (3) Through the collaborative design of each unit, the overall circuit ensures the consistency of signal transmission while dynamically adapting to signal strength and suppressing interference.

[0008] In addition, the anti-interference signal stable transmission circuit based on an adaptive gain amplifier disclosed in this invention may also have the following additional technical features: Furthermore, the first amplification unit includes: Amplifier Q1 outputs the first amplified signal; Resistor Rf11, with its two ends connected to the inverting input terminal and the output terminal of amplifier Q1, respectively; Resistor Rf12, with its two ends connected to the non-inverting input terminal of amplifier Q1 and ground, respectively; Resistor R11, one end of which is connected to the inverting input terminal of amplifier Q1, and the other end of which is used to input the first adjustment signal; Resistor R12, one end of which is connected to the non-inverting input terminal of amplifier Q1, and the other end of which is used to input the signal to be processed; A resistor Rx11 has its two ends connected to the power supply and ground, respectively. The two ends of resistor Rx12 are respectively connected to the end of resistor R11 that receives the first adjustment signal and the end of resistor Rx11 that is connected to the power supply.

[0009] Further, the filtering unit includes: Amplifier Q2, which outputs the filtered signal; Resistor Rf21, with its two ends connected to the inverting input terminal and the output terminal of amplifier Q2, respectively; Resistor Rf22, with its two ends connected to the non-inverting input terminal of amplifier Q2 and ground, respectively; Resistor R21, one end of which is connected to the inverting input terminal of amplifier Q2, and the other end of which is used to input the inverted signal of the first amplified signal; Resistor R22 has one end connected to the non-inverting input of amplifier Q2, and the other end used to input the first amplified signal.

[0010] Furthermore, the second amplification unit includes: Amplifier Q3 outputs the second amplified signal; Resistor Rf31, with its two ends connected to the inverting input and output terminals of amplifier Q3, respectively; Resistor Rf32, with its two ends connected to the non-inverting input terminal of amplifier Q3 and ground, respectively; Resistor R31, one end of which is connected to the inverting input terminal of amplifier Q3, and the other end of which is used to input the inverted signal of the filtered signal; Resistor R32 has one end connected to the non-inverting input of amplifier Q3, and the other end used to input the filtered signal.

[0011] Furthermore, the feedback unit includes: Amplifier Q4 outputs the feedback signal; Resistor Rf41, with its two ends connected to the inverting input and output terminals of amplifier Q4, respectively; Resistor Rf42, with its two ends connected to the non-inverting input terminal of amplifier Q4 and ground, respectively; Resistor R41, one end of which is connected to the inverting input terminal of amplifier Q4, and the other end of which is used to input the signal to be processed; Resistor R42, one end of which is connected to the non-inverting input terminal of amplifier Q4, and the other end of which is used to input the filtered signal and random noise; Resistor Rx21, one end of which is connected to the power supply; Resistor Rx22, with its two ends connected to the other end of resistor Rx21 and ground respectively; The connection terminals of resistors Rx21 and Rx22 are connected to the end of resistor R41 that receives the signal to be processed.

[0012] Further, the coupling unit includes: Resistor Rx31, one end of which is connected to ground; Resistor Rx32, one end of which is connected to the other end of resistor Rx31, and the other end of which is input to the first adjustment signal; The connection terminals of resistors Rx31 and Rx32 are connected to one end of resistor R31 where the inverted signal of the filtered signal is input.

[0013] Additional features and advantages of this invention will be set forth in the description which follows, or may be learned by practicing the invention. Attached Figure Description

[0014] The technical solution and beneficial effects of the present invention will become apparent and readily understood from the following description in conjunction with the accompanying drawings, wherein: Figure 1 This is a circuit diagram of the anti-interference signal stable transmission circuit based on an adaptive gain amplifier according to the present invention. Figure 2 This is a schematic diagram of the anti-interference signal stable transmission circuit based on an adaptive gain amplifier according to the present invention. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] The anti-interference signal stable transmission circuit based on an adaptive gain amplifier disclosed in this invention will now be described with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 2 As shown, the anti-interference signal stable transmission circuit based on an adaptive gain amplifier includes: The first amplification unit receives the signal to be processed UIN1 and the first adjustment signal UIN2 in common mode and outputs the first amplified signal U1. Specifically, such as Figure 1 As shown in part a, the first amplification unit includes: Amplifier Q1 outputs the first amplified signal U1; Resistor Rf11, with its two ends connected to the inverting input and output terminals of amplifier Q1, respectively; Resistor Rf12, with its two ends connected to the non-inverting input terminal of amplifier Q1 and ground, respectively; Resistor R11, one end of which is connected to the inverting input terminal of amplifier Q1, and the other end of which is used to input the first adjustment signal UIN2; Resistor R12, one end of which is connected to the non-inverting input terminal of amplifier Q1, and the other end of which is used to input the signal to be processed, UIN1; A resistor Rx11 has its two ends connected to the power supply and ground, respectively. Resistor Rx12, its two ends are respectively connected to one end of resistor R11 that inputs the first adjustment signal UIN2 and the end of resistor Rx11 that is connected to the power supply; It should be noted that, in one embodiment of the present invention, the gain coefficient of the first amplification unit is k1, the gain coefficient of the second amplification unit is k2, and therefore the overall gain coefficient of the anti-interference signal stable transmission circuit based on the adaptive gain amplifier is K=k1×k2. The resistance values ​​of resistor R11 and resistor R12 are the same, and the resistance values ​​of resistor Rf11 and resistor Rf12 are the same. The amplifier Q1 outputs a first amplified signal U1, which is U1 = [Rf11 × (UIN1 - UIN2)] ÷ R11. The input signals are UIN1 to be processed and UIN2 to be adjusted. Adjusting UIN2 will adjust the amplitude of the first amplified signal U1.

[0018] For other technical details in this embodiment, please refer to other embodiments; they will not be repeated here.

[0019] The filtering unit receives the first amplified signal U1 in differential mode and outputs the filtered signal U2. Specifically, such as Figure 1 As shown in section b, the filtering unit includes: Amplifier Q2, whose output is filtered signal U2; Resistor Rf21, with its two ends connected to the inverting input and output terminals of amplifier Q2, respectively; Resistor Rf22, with its two ends connected to the non-inverting input terminal of amplifier Q2 and ground, respectively; Resistor R21, one end of which is connected to the inverting input terminal of amplifier Q2, and the other end of which is used to input the inverted signal U1- of the first amplified signal U1; Resistor R22 has one end connected to the non-inverting input of amplifier Q2, and the other end is used to input the first amplified signal U1.

[0020] It should be noted that, in one embodiment of the present invention, the resistance values ​​of resistor R21 and resistor R22 are the same, the resistance values ​​of resistor Rf21 and resistor Rf22 are the same, and the resistance value of resistor R21 is twice the resistance value of resistor Rf21. The output filtered signal U2 of amplifier Q2 is U2={Rf21×[(U1+)-(U1-)]}÷R21=U1+, where amplifier Q2 inputs the first amplified signal U1 and its corresponding inverted signal U1- to achieve differential filtering. At the same time, since the resistance of resistor R21 is twice the resistance of resistor Rf21, its output filtered signal U2 is equal to the filtered first amplified signal U1.

[0021] For other technical details in this embodiment, please refer to other embodiments; they will not be repeated here.

[0022] The second amplification unit receives the filter signal U2 and the second adjustment signal in common mode and outputs the second amplified signal U3. Specifically, such as Figure 1 As shown in section c, the second amplification unit includes: Amplifier Q3 outputs a second amplified signal U3; Resistor Rf31, with its two ends connected to the inverting input and output terminals of amplifier Q3, respectively; Resistor Rf32, with its two ends connected to the non-inverting input terminal of amplifier Q3 and ground, respectively; Resistor R31, one end of which is connected to the inverting input terminal of amplifier Q3, and the other end of which is used to input the inverted signal U2- of the filter signal U2; Resistor R32 has one end connected to the non-inverting input of amplifier Q3, and the other end used to input the filtered signal U2.

[0023] It should be noted that, in one embodiment of the present invention, the resistance value of resistor R31 is the same as that of resistor R32, and the resistance value of resistor Rf31 is the same as that of resistor Rf32. The amplifier Q3 outputs a second amplified signal U3, which is U3={Rf31×[(U2+)-(U2-)]}÷R31, where the input is the filter signal U2 and the inverting signal U2-. Adjusting the filter signal U2 will adjust the amplitude of the second amplified signal U3.

[0024] For other technical details in this embodiment, please refer to other embodiments; they will not be repeated here.

[0025] The feedback unit receives the signal to be processed UIN1 and the filtered signal U2 in common mode to adjust the gain coefficient of the first amplification unit. Specifically, such as Figure 1 As shown in section d, the feedback unit includes: Amplifier Q4, whose output feedback signal U4; Resistor Rf41, with its two ends connected to the inverting input and output terminals of amplifier Q4, respectively; Resistor Rf42, its two ends are connected to the non-inverting input terminal of amplifier Q4 and ground respectively; Resistor R41, one end of which is connected to the inverting input terminal of amplifier Q4, and the other end of which is used to input the signal to be processed, UIN1; Resistor R42, one end of which is connected to the non-inverting input of amplifier Q4, and the other end is used for input filtering signal U2 and random noise; Resistor Rx21, one end of which is connected to the power supply; Resistor Rx22, with its two ends connected to the other end of resistor Rx21 and ground respectively; The connection terminals of resistors Rx21 and Rx22 are connected to one end of resistor R41 to input the signal UIN1 to be processed.

[0026] It should be noted that, in one embodiment of the present invention, the resistance values ​​of resistor R41 and R42 are the same, the resistance values ​​of resistor Rf41 and Rf42 are the same, and the resistance values ​​of resistor Rx21 and Rx22 satisfy (Rx21×Rx22)÷(Rx21+Rx22)=1-{(R11×k1)÷[Rf11×(k1-1)]}; The feedback signal U4 output by amplifier Q4 is U4=[Rf41×(U2-UIN1)]÷R41, where the input signal to be processed is UIN1 and the filter signal is U2. Adjusting the filter signal U2 will adjust the amplitude of the feedback signal U4.

[0027] For other technical details in this embodiment, please refer to other embodiments; they will not be repeated here.

[0028] A coupling unit, which adjusts the gain coefficient of the second amplification unit based on a first adjustment signal UIN2; Specifically, such as Figure 1 As shown in part e, the coupling unit includes: Resistor Rx31, one end of which is connected to ground; Resistor Rx32, one end of which is connected to the other end of resistor Rx31, and the other end of which is input to the first adjustment signal UIN2; The connection terminals of resistors Rx31 and Rx32 are connected to one end of the inverted signal U2- of the input filter signal U2 of resistor R31.

[0029] It should be noted that, in one embodiment of the present invention, the resistance values ​​of resistor Rx31 and resistor Rx32 satisfy Rx31÷Rx32=[K(k1-1)]÷(k2-1).

[0030] For other technical details in this embodiment, please refer to other embodiments; they will not be repeated here.

[0031] In addition, this anti-interference signal stabilization transmission circuit based on an adaptive gain amplifier also includes: like Figure 1 As shown in section f, the control unit is equipped with a window comparator and an MCU. The window comparator is used to input the feedback signal U4 and output the comparison result. The MCU receives the comparison result and adjusts the resistance values ​​of resistors Rx12, Rx21, Rx22, Rx31 and Rx32. It should be noted that, in one embodiment of the present invention, resistors Rx12, Rx21, Rx22, Rx31, and Rx32 are all digital potentiometers, and the MCU adjusts the resistance value of each resistor according to the corresponding value relationship of each resistor in the above embodiment.

[0032] For other technical details in this embodiment, please refer to other embodiments; they will not be repeated here.

[0033] When this anti-interference signal stable transmission circuit based on adaptive gain amplifier is working, the relevant personnel connect the signal to be processed UIN1 to the non-inverting input terminal of amplifier Q1 and measure the amplitude of the signal to be processed UIN1 using tools such as an oscilloscope. The first adjustment signal UIN2, which is equal to 10% of the amplitude of the signal to be processed UIN1, is connected to the inverting input terminal of amplifier Q1. Since the signal to be processed UIN1 and the first adjustment signal UIN2 are output in common mode, the final output first amplified signal U1 is the difference between the signal to be processed UIN1 and the first adjustment signal UIN2 multiplied by the ratio of resistor Rf11 and resistor R11. At this time, the gain coefficient of amplifier Q1 is k1, which is the ratio of the first amplified signal U1 and the signal to be processed UIN1. The generated first amplified signal U1 is input to amplifier Q2 in differential mode. Therefore, the final output filtered signal is the difference between the first amplified signal U1 and its inverted signal U1- multiplied by the ratio of resistor Rf21 to resistor R21. Since the first amplified signal U1 and its inverted signal U1- are inversely related, the difference between the first amplified signal U1 and its inverted signal U1- is 2 × U1. At the same time, since the resistance of resistor R21 is twice the resistance of resistor Rf21, the ratio of resistor Rf21 to resistor R21 is 1 / 2. The final filtered signal U2 is the first amplified signal U1. This method mainly relies on amplifier Q2 to construct a differential circuit, which is only used to remove noise from the first amplified signal U1 using the differential principle, and does not change the amplitude of the first amplified signal U1. The generated filtered signal U2 and the signal to be processed UIN1 are input to amplifier Q4 in common-mode. Since the filtered signal U2 is obtained by amplifying and filtering the signal to be processed UIN1, ideally, the ratio of the filtered signal U2 to the signal to be processed UIN1 should be a constant. That is, the amplification and filtering effect can be judged by calculating whether the ratio of the filtered signal U2 to the signal to be processed UIN1 remains constant and whether this constant fluctuates within a small range. However, directly calculating whether the ratio of the filtered signal U2 to the signal to be processed UIN1 remains constant and whether this constant fluctuates within a small range is difficult to achieve. Therefore, the difference between the filtered signal U2 and the signal to be processed UIN1 is added to the signal to be processed UIN1, and then the result after adding the difference is calculated. Whether the difference between the signal to be processed, UIN1, and the filtered signal, U2 remains within a small range can indirectly determine the amplification and filtering effect. At this time, the filtered signal, U2, is divided by resistors Rx21 and Rx22. The difference between resistors Rx21 and Rx22 satisfies (Rx21×Rx22)÷(Rx21+Rx22)=1-{(R11×k1)÷[Rf11×(k1-1)]}. Therefore, based on the voltage divider theorem, the voltage value on resistor Rx21 is the difference between the signal to be processed, UIN1, and the filtered signal, U2. It should be noted that since the filtered signal, U2, is introduced into both the non-inverting and inverting input terminals of amplifier Q4, random noise needs to be added to the non-inverting input terminal to enhance the overall robustness. The voltage value on resistor Rx21 and the signal to be processed UIN1 are connected to the inverting input of amplifier Q4. At the same time, the filtered signal U2 and random noise are connected to the non-inverting input of amplifier Q4. The output feedback signal U4 is the difference between the signal to be processed UIN1 and the filtered signal U2 after adding the difference. Feedback signal U4 is connected to a window comparator, which has upper and lower thresholds. This comparator determines whether the difference between the processed signal UIN1 (after adding the difference) and the filtered signal U2, i.e., whether the feedback signal U4 fluctuates within a small range. If the feedback signal U4 exceeds the upper threshold, it indicates that the filtering effect of amplifier Q2 is poor. Then the MCU adjusts the resistance value of resistor Rx12. Resistor Rx12 affects the adjustment signal UIN2 based on the voltage divider theorem, making it smaller. Based on U1=[Rf11×(UIN1-UIN2)]÷R11, that is, reducing the adjustment signal UIN2 to increase the difference between the signal to be processed UIN1 and the adjustment signal UIN2, making the gain coefficient k1 of amplifier Q1 larger, thus making it easier to distinguish the noise of the signal to be processed UIN1. If the feedback signal U4 exceeds the lower threshold, it indicates that the filtered signal U2 is distorted. This is because random noise is added to the non-inverting input of amplifier Q4, so the feedback signal U4 will definitely fluctuate to a certain extent. If the fluctuation is too small, it indicates that the filtered signal U2 is distorted. In this case, the MCU adjusts the resistance value of resistor Rx12. Resistor Rx12 affects the adjustment signal UIN2 based on the voltage divider theorem, increasing it. Based on U1=[Rf11×(UIN1-UIN2)]÷R11, this means increasing the adjustment signal UIN2 to reduce the difference between the signal to be processed UIN1 and the adjustment signal UIN2, thereby reducing the gain coefficient k1 of amplifier Q1 and avoiding distortion.

[0034] It is easy to see from the above that the overall workflow is as follows: the signal UIN1 to be processed is amplified by amplifier Q1 (gain coefficient k1), filtered by amplifier Q2, amplified by amplifier Q3 (gain coefficient k2), and adjusted by feedback by amplifier Q4. Because of the feedback adjustment of amplifier Q4, the gain coefficient k1 of amplifier Q1 will change (adjusting the increase or decrease of signal UIN2). If the gain coefficient k2 of amplifier Q3 is not adjusted, the gain coefficient K = k1 × k2 of the entire circuit will not be able to maintain a constant. This will result in the second amplified signal U3 being output without practical value. Therefore, a coupling circuit needs to be introduced between amplifier Q1 and amplifier Q3 so that when the gain coefficient k1 of amplifier Q1 increases, the gain coefficient k2 of amplifier Q3 decreases, and vice versa. That is, when the gain coefficient k1 of amplifier Q1 decreases, the gain coefficient k2 of amplifier Q3 increases. In other words, the gain coefficient K = k1 × k2 of the entire circuit is maintained as a constant. The coupling circuit consists of resistors Rx31 and Rx32. The resistance values ​​of Rx31 and Rx32 satisfy Rx31÷Rx32=[K(k1-1)]÷(k2-1). Resistor Rx31 divides the adjustment signal UIN2 based on the voltage divider theorem. The voltage divider signal on resistor Rx31 and the inverted signal U2- of the filter signal U2 are connected to the inverting input terminal of amplifier Q3. The filter signal U2 is connected to the non-inverting input terminal of amplifier Q3. At this time, the gain coefficient k2 of amplifier Q3 can satisfy K=k1×k2 and remain a constant, ultimately enabling the entire circuit to achieve a constant gain of K times.

[0035] In summary, the anti-interference signal stable transmission circuit based on an adaptive gain amplifier disclosed in this invention has at least the following beneficial effects: (1) The gain of the second amplification unit is adjusted by the coupling unit based on the first adjustment signal, and the gain of the first amplification unit is adjusted by the feedback unit to build a coordinated adjustment mechanism of the amplification gain of the front and rear stages, so as to stabilize the overall gain; (2) The feedback unit inputs the signal to be processed and the filtered signal in common mode so that the gain adjustment can be adapted to the characteristics of the signal after amplification and filtering; (3) Through the collaborative design of each unit, the overall circuit ensures the consistency of signal transmission while dynamically adapting to signal strength and suppressing interference.

[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An anti-jamming signal stabilization transmission circuit based on an adaptive gain amplifier, characterized in that, The application relates to a signal processing circuit, comprising: a first amplification unit which inputs a signal to be processed and a first adjusting signal in common mode to output a first amplified signal; a filter unit which inputs the first amplified signal in differential mode to output a filtered signal; a second amplification unit which inputs the filtered signal and a second adjusting signal in common mode to output a second amplified signal; a feedback unit which inputs the signal to be processed and the filtered signal in common mode to adjust the gain coefficient of the first amplification unit; a coupling unit which adjusts the gain coefficient of the second amplification unit based on the first adjusting signal.

2. The adaptive gain amplifier based anti-jam signal stabilization transmission circuit of claim 1, wherein, The first amplification unit comprises: an amplifier Q1 which outputs the first amplified signal; a resistor Rf11 whose two ends are connected to the inverting input and output of the amplifier Q1 respectively; a resistor Rf12 whose two ends are connected to the non-inverting input and ground of the amplifier Q1 respectively; a resistor R11 whose one end is connected to the inverting input of the amplifier Q1 and whose other end is used for inputting the first adjusting signal; a resistor R12 whose one end is connected to the non-inverting input of the amplifier Q1 and whose other end is used for inputting the signal to be processed; a resistor Rx11 whose two ends are connected to a power supply and ground respectively; a resistor Rx12 whose two ends are connected to the one end of the resistor R11 inputting the first adjusting signal and the one end of the resistor Rx11 connected to the power supply respectively.

3. The AGA-based anti-jam signal stabilization transmission circuit of claim 1, wherein, The filter unit comprises: an amplifier Q2 which outputs the filtered signal; a resistor Rf21 whose two ends are connected to the inverting input and output of the amplifier Q2 respectively; a resistor Rf22 whose two ends are connected to the non-inverting input and ground of the amplifier Q2 respectively; a resistor R21 whose one end is connected to the inverting input of the amplifier Q2 and whose other end is used for inputting the inverted signal of the first amplified signal; a resistor R22 whose one end is connected to the non-inverting input of the amplifier Q2 and whose other end is used for inputting the first amplified signal.

4. The adaptive gain amplifier based anti-jam signal stabilization transmission circuit of claim 1, wherein, The second amplification unit comprises: an amplifier Q3 which outputs the second amplified signal; a resistor Rf31 whose two ends are connected to the inverting input and output of the amplifier Q3 respectively; a resistor Rf32 whose two ends are connected to the non-inverting input and ground of the amplifier Q3 respectively; a resistor R31 whose one end is connected to the inverting input of the amplifier Q3 and whose other end is used for inputting the inverted signal of the filtered signal; a resistor R32 whose one end is connected to the non-inverting input of the amplifier Q3 and whose other end is used for inputting the filtered signal.

5. The adaptive gain amplifier based anti-jam signal stabilization transmission circuit of claim 1, wherein, The feedback unit comprises: an amplifier Q4 which outputs the feedback signal; a resistor Rf41 whose two ends are connected to the inverting input and output of the amplifier Q4 respectively; a resistor Rf42 whose two ends are connected to the non-inverting input and ground of the amplifier Q4 respectively; a resistor R41 whose one end is connected to the inverting input of the amplifier Q4 and whose other end is used for inputting the signal to be processed; a resistor R42 whose one end is connected to the non-inverting input of the amplifier Q4 and whose other end is used for inputting the filtered signal and random noise. a resistor Rx21, one end of which is connected to a power supply; a resistor Rx22, two ends of which are respectively connected to the other end of the resistor Rx21 and a ground terminal; the connecting end of the resistor Rx21 and the resistor Rx22 is connected to one end of the resistor R41 inputting the signal to be processed.

6. The adaptive gain amplifier based anti-jam signal stabilization transmission circuit of claim 1, wherein, the coupling unit comprises: a resistor Rx31, one end of which is connected to a ground terminal; a resistor Rx32, one end of which is connected to the other end of the resistor Rx31, and the other end of which inputs the first adjusted signal; the connecting end of the resistor Rx31 and the resistor Rx32 is connected to one end of the resistor R31 inputting the inverted signal of the filtered signal.

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