An adaptive receive amplification circuit structure

Abstract

The utility model relates to a kind of self-adapting receiving amplifier circuit structure, comprising: photoelectric receiving tube, continuously receives the initial light signal of outside, and initial light signal is converted into initial electric signal corresponding;At least one amplifier, initial electric signal is amplified to obtain amplification signal;Sampler, the sampling signal of the amplification signal is obtained by sampling;At least one comparator, receive sampling signal, when sampling signal is greater than preset threshold, output trigger signal;At least one gain controller, receive trigger signal and reduce the gain for the amplifier, so that amplifier is in linear operating area.The self-adapting receiving amplifier circuit structure of the utility model realizes dynamic gain feedback and nonlinear signal intensity self-adaption, guarantees the effective distance of far-end transmitting terminal.

Description

Technical Field

[0001] This utility model relates to the field of circuit design, and in particular to an adaptive receiver amplifier circuit structure. Background Technology

[0002] Optoelectronic signal systems transmit voice and control commands via optical signals, including infrared signal systems and laser signal systems. Their core performance depends on the signal amplification circuit design at the receiver end of the optoelectronic signal system.

[0003] Existing optical signal receiving and amplification circuits typically use a preamplifier to directly amplify the electrical signal converted by the photodetector. The amplified signal is then directly input into the subsequent stage. The photodetector is a semiconductor device that converts optical signals into electrical signals. Its operating principle is based on the photoelectric effect and semiconductor characteristics; the higher the intensity of the received light, the greater the current generated by the photodetector. However, in multi-transmitter applications of optoelectronic signal systems, the imbalance in the dynamic range of signal strength caused by spatial distribution differences will lead to nonlinear distortion and dynamic range compression effects in the preamplifier circuit at the receiving end.

[0004] Specifically, when there are two or more transmitting terminals in the system, the difference in distance between each transmitting terminal and the receiving terminal will cause the output current of the photodetector to exhibit an exponential decay characteristic. If the preamplifier adopts a fixed gain design, the strong light signal from the near-end transmitting terminal will force the preamplifier into the saturation operating region. At this time, the weak signal from the far-end transmitting terminal will not be effectively quantized due to the dynamic range compression effect of the amplification channel. Therefore, when a transmitting terminal is very close to the receiving terminal, the preamplifier will saturate due to the excessive signal, thus failing to amplify the signal from the far-end transmitting terminal properly, severely affecting the effective range of the far-end transmitting terminal. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide an adaptive receiver amplifier circuit structure that can realize dynamic gain feedback and nonlinear signal strength adaptation, thereby ensuring the effective distance of the remote transmitting terminal.

[0006] An adaptive receiver amplifier circuit structure includes:

[0007] The photoelectric receiver tube continuously receives the initial light signal from the outside world and converts the initial light signal into an initial electrical signal accordingly.

[0008] At least one amplifier amplifies the initial electrical signal to obtain an amplified signal;

[0009] The sampler samples the amplified signal to obtain a sampled signal;

[0010] At least one comparator receives a sampled signal and outputs a trigger signal when the sampled signal is greater than a preset threshold.

[0011] At least one gain controller receives a trigger signal and reduces the gain of the amplifier to bring the amplifier into the linear operating region.

[0012] Furthermore, it also includes a first comparator, a second comparator, and a third comparator, which are respectively connected to the sampler. The sampled signal enters each comparator. When the sampled signal is greater than a preset threshold in the corresponding comparator, the comparator issues a trigger signal. The thresholds of the first comparator, the second comparator, and the third comparator are set to low threshold, medium threshold, and high threshold in ascending order.

[0013] Furthermore, the gain controller is connected to the first comparator, the second comparator, and the third comparator respectively. When the trigger signal of the first comparator is input into the gain controller, the gain controller reduces the gain of the amplifier by 10dB; when the trigger signal of the second comparator is input into the gain controller, the gain controller reduces the gain of the amplifier by 20dB; and when the trigger signal of the third comparator is input into the gain controller, the gain controller reduces the gain of the amplifier by 30dB.

[0014] Furthermore, it also includes a first-stage amplifier and a second-stage amplifier;

[0015] The first-stage amplifier is connected to the photodetector to amplify the initial electrical signal to obtain the first-stage amplified signal;

[0016] The second-stage amplifier is connected to the first-stage amplifier to amplify the first-stage amplified signal to obtain the second-stage amplified signal;

[0017] The sampler is connected to the second-stage amplifier and samples the second-stage amplified signal to obtain a sampled signal;

[0018] The comparator receives a sampled signal from the sampler, and when the sampled signal is greater than a preset threshold in the comparator, the comparator outputs a trigger signal.

[0019] The gain controller receives a trigger signal from the comparator and reduces the gain for the first-stage amplifier so that the first-stage amplifier is in the linear operating region.

[0020] Furthermore, it also includes a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a first gain controller, a second gain controller, and a third gain controller;

[0021] The first-stage amplifier is connected to the photodetector to amplify the initial electrical signal to obtain the first-stage amplified signal;

[0022] The second-stage amplifier is connected to the first-stage amplifier to amplify the first-stage amplified signal to obtain the second-stage amplified signal;

[0023] The third-stage amplifier is connected to the second-stage amplifier to amplify the second-stage amplified signal to obtain the third-stage amplified signal;

[0024] The sampler is connected to the third-stage amplifier and samples the third-stage amplified signal to obtain a sampled signal;

[0025] The comparator receives a sampled signal from the sampler, and when the sampled signal is greater than a preset threshold in the comparator, the comparator outputs a trigger signal.

[0026] The first gain controller receives a trigger signal from the comparator and reduces the gain for the first stage amplifier to make the first stage amplifier operate in the linear region; the second gain controller receives a trigger signal from the comparator and reduces the gain for the second stage amplifier to make the second stage amplifier operate in the linear region; the third gain controller receives a trigger signal from the comparator and reduces the gain for the third stage amplifier to make the third stage amplifier operate in the linear region.

[0027] Furthermore, the initial gains of the first gain controller, the second gain controller, and the third gain controller are different.

[0028] Furthermore, the sampler is connected to the preamplifier via an interstage coupling capacitor.

[0029] Furthermore, it includes a photodetector, a transimpedance amplifier, a sampler, a comparator, an amplifier, and a gain controller.

[0030] The photoelectric receiver continuously receives the initial light signal from the outside world and converts the initial light signal into an initial electrical signal accordingly.

[0031] The transimpedance amplifier is connected to the photodetector to amplify the initial electrical signal to obtain the transimpedance amplified signal;

[0032] The sampler is connected to the transimpedance amplifier and samples the transimpedance amplified signal to obtain a sampled signal;

[0033] The comparator receives a sampled signal from the sampler, and when the sampled signal is greater than a preset threshold in the comparator, the comparator outputs a trigger signal.

[0034] The gain controller receives a trigger signal from the comparator and reduces the gain of the amplifier to bring the amplifier into the linear operating region.

[0035] The amplifier is connected to the photodetector tube to amplify the initial electrical signal to obtain an amplified signal.

[0036] Furthermore, the gain controller employs a variable impedance element whose resistance decreases as the voltage across it increases.

[0037] Furthermore, the amplified signal is an analog signal, and the sampled signal is a digital signal.

[0038] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the adaptive receiver amplifier circuit structure in Embodiment 1 of this utility model;

[0040] Figure 2 This is a schematic diagram of the adaptive receiver amplifier circuit structure in Embodiment 2 of this utility model;

[0041] Figure 3 This is a schematic diagram of the adaptive receiver amplifier circuit structure in Embodiment 3 of this utility model;

[0042] Figure 4 This is a schematic diagram of the adaptive receiver amplifier circuit structure in Embodiment 4 of this utility model;

[0043] Figure 5 This is a schematic diagram of the adaptive receiver amplifier circuit structure in Embodiment 5 of this utility model. Detailed Implementation

[0044] Example 1

[0045] Based on this, please refer to Figure 1 This utility model provides an adaptive receiver amplifier circuit structure, including a photodetector 1, an amplifier 2, a sampler 3, a comparator 4, and a gain controller 5.

[0046] The photoelectric receiver 1 continuously receives the initial light signal from the outside and converts the initial light signal into an initial electrical signal accordingly;

[0047] The amplifier 2 is connected to the photodetector 1 and amplifies the initial electrical signal input from the photodetector 1 to obtain an amplified signal.

[0048] The sampler 3 is connected to the amplifier 2 and samples the amplified signal to obtain a sampled signal. The sampler 3 uses an analog-to-digital converter (ADC) to convert the amplified signal in analog form into a sampled signal in digital form, so that level comparison can be realized in the comparator 4. The detection accuracy can be changed by adjusting the sampling frequency of the amplified signal. The higher the sampling frequency, the higher the fidelity of the amplified signal.

[0049] The comparator 4 is connected to the sampler 3. The sampled signal enters the comparator 4. When the sampled signal is greater than a preset threshold in the comparator 4, the comparator 4 outputs a high-level trigger signal.

[0050] The gain controller 5 is connected to the comparator 4. The trigger signal is input into the gain controller 5, which reduces the resistance of the variable impedance element in the gain controller 5, thereby reducing the gain of the amplifier 2 and preventing the amplifier 2 from entering the saturation operating region.

[0051] The post-amplifier unit is connected to amplifier 2, and the amplified signal is input to the post-amplifier unit to complete the process of receiving and amplifying the optical signal.

[0052] Example 2

[0053] In practical applications, it was found that the adaptive receiver amplifier circuit structure in Example 1 is not well-suited for situations where the intensity of the initial input optical signal varies significantly. If the comparator threshold is set too high, the amplifier will saturate before the sampled signal reaches the threshold. If the comparator threshold is set too low, the gain controller's adjustment range will be exceeded when the initial optical signal increases to a certain extent. Setting the comparator threshold to an intermediate value results in both of these problems simultaneously. Therefore, the adaptive receiver amplifier circuit structure in Example 2, based on Example 1, uses multiple comparators with different thresholds. This allows for the generation of adjustment signals with varying intensities for different initial optical signals, enabling graded adjustment of the gain controller's gain, improving adjustment accuracy while expanding the adjustment range.

[0054] Please see Figure 2 The adaptive receiver amplifier circuit structure of this embodiment 2 includes a photodetector 1, an amplifier 2, a sampler 3, a first comparator 41, a second comparator 42, a third comparator 43, and a gain controller 5.

[0055] The photoelectric receiver 1 continuously receives the initial light signal from the outside and converts the initial light signal into an initial electrical signal accordingly;

[0056] The amplifier 2 is connected to the photodetector 1 and amplifies the initial electrical signal input from the photodetector 1 to obtain an amplified signal.

[0057] The sampler 3 is connected to the amplifier 2 and samples the amplified signal to obtain a sampled signal;

[0058] The first comparator 41, the second comparator 42 and the third comparator 43 are respectively connected to the sampler 3. The sampled signal enters each comparator. When the sampled signal is greater than the preset threshold in the corresponding comparator, the comparator issues a trigger signal. Preferably, the threshold of the first comparator 41 is set to a low threshold, the threshold of the second comparator 42 is set to a medium threshold and the threshold of the third comparator 43 is set to a high threshold.

[0059] The gain controller 5 is connected to the first comparator 41, the second comparator 42, and the third comparator 43 respectively. When the trigger signal of the first comparator 41 is input to the gain controller 5, the resistance of the variable impedance element in the gain controller 5 decreases slightly, thereby reducing the gain of the amplifier 2 by 10dB. When the trigger signal of the second comparator 42 is input to the gain controller 5, the resistance of the variable impedance element in the gain controller 5 decreases moderately, thereby reducing the gain of the amplifier 2 by 20dB. When the trigger signal of the third comparator 43 is input to the gain controller 5, the resistance of the variable impedance element in the gain controller 5 decreases significantly, thereby reducing the gain of the amplifier 2 by 30dB.

[0060] The post-amplifier unit is connected to amplifier 2, and the amplified signal is input to the post-amplifier unit to complete the process of receiving and amplifying the optical signal.

[0061] It is understood that the number of comparators is not limited to three, and the threshold setting of each comparator is not fixed. The purpose is to improve the accuracy of dynamic response; the more comparators there are, the higher the accuracy.

[0062] Example 3

[0063] In practical applications, it was found that the amplifier in the adaptive receiver amplifier circuit structure of Embodiment 1 has limited amplification of the initial electrical signal, making it difficult to meet the requirements of high-intensity scenarios. Therefore, the adaptive receiver amplifier circuit structure of Embodiment 3, based on Embodiment 1, sets up multiple amplifiers to amplify the signal in multiple stages, thereby increasing the signal amplification degree.

[0064] Please see Figure 3 The adaptive receiver amplifier circuit structure of this embodiment 3 includes a photodetector 1, a first-stage amplifier 21, a second-stage amplifier 22, a sampler 3, a comparator 4, and a gain controller 5.

[0065] The photoelectric receiver 1 continuously receives the initial light signal from the outside and converts the initial light signal into an initial electrical signal accordingly;

[0066] The first-stage amplifier 21 is connected to the photodetector 1 and amplifies the initial electrical signal input from the photodetector 1 to obtain the first-stage amplified signal;

[0067] The second-stage amplifier 22 is connected to the first-stage amplifier 21 to amplify the first-stage amplified signal to obtain the second-stage amplified signal;

[0068] The sampler 3 is connected to the second-stage amplifier 22 and samples the second-stage amplified signal to obtain a sampled signal;

[0069] The comparator 4 is connected to the sampler 3. The sampled signal enters the comparator 4. When the sampled signal is greater than a preset threshold in the comparator 4, the comparator 4 outputs a high-level trigger signal.

[0070] The gain controller 5 is connected to the comparator 4. The trigger signal is input into the gain controller 5, which reduces the resistance of the variable impedance element in the gain controller 5, thereby reducing the gain of the first-stage amplifier 21 to prevent the first-stage amplifier 21 from entering the saturation operating region.

[0071] The post-amplifier unit is connected to the second-stage amplifier 22, and the amplified signal is input to the post-amplifier unit to complete the process of receiving and amplifying the optical signal.

[0072] It is understandable that the number of amplifiers is not limited to two. Multiple amplifiers can be connected to achieve multi-stage amplification. The sampler is set at the output of the subsequent amplifier and fed back to the gain controller before the previous amplifier through the inter-stage coupling capacitor, thereby realizing cross-stage gain adjustment.

[0073] Example 4

[0074] In practical applications, it was found that the amplifier in the adaptive receiver amplifier circuit structure of Embodiment 3 has low flexibility in amplifying the initial electrical signal, making it difficult to meet the needs of complex scenarios. Therefore, the adaptive receiver amplifier circuit structure of Embodiment 4, based on Embodiment 3, cascades multiple amplifiers together and connects each amplifier to a comparator through a gain controller, thereby enabling simultaneous synchronous and discrete adjustment of multiple amplifier stages through a single comparator.

[0075] Please see Figure 4 The adaptive receiver amplifier circuit structure of this embodiment 4 includes a photodetector 1, a first-stage amplifier 21, a second-stage amplifier 22, a third-stage amplifier 23, a sampler 3, a comparator 4, a first gain controller 51, a second gain controller 52, and a third gain controller 53.

[0076] The photoelectric receiver 1 continuously receives the initial light signal from the outside and converts the initial light signal into an initial electrical signal accordingly;

[0077] The first-stage amplifier 21 is connected to the photodetector 1 and amplifies the initial electrical signal input from the photodetector 1 to obtain the first-stage amplified signal;

[0078] The second-stage amplifier 22 is connected to the first-stage amplifier 21 to amplify the first-stage amplified signal to obtain the second-stage amplified signal;

[0079] The third-stage amplifier 23 is connected to the second-stage amplifier 22 to amplify the second-stage amplified signal to obtain the third-stage amplified signal;

[0080] The sampler 3 is connected to the third-stage amplifier 23 and samples the third-stage amplified signal to obtain a sampled signal;

[0081] The comparator 4 is connected to the sampler 3. The sampled signal enters the comparator 4. When the sampled signal is greater than a preset threshold in the comparator 4, the comparator 4 outputs a high-level trigger signal.

[0082] The first gain controller 51 is connected to the comparator 4. The trigger signal is input into the gain controller 5, causing the resistance of the variable impedance element in the gain controller 5 to decrease, thereby reducing the gain for the first-stage amplifier 21 to prevent the first-stage amplifier 21 from entering the saturation operating region. The second gain controller 52 is connected to the comparator 4. The trigger signal is input into the second gain controller 52, causing the resistance of the variable impedance element in the second gain controller 52 to decrease, thereby reducing the gain for the second-stage amplifier 22 to prevent the second-stage amplifier 22 from entering the saturation operating region. The third gain controller 53 is connected to the comparator 4. The trigger signal is input into the third gain controller 53, causing the resistance of the variable impedance element in the third gain controller 53 to decrease, thereby reducing the gain for the third-stage amplifier 23 to prevent the third-stage amplifier 23 from entering the saturation operating region.

[0083] The subsequent unit is connected to the third-stage amplifier 23, and the amplified signal is input to the subsequent unit to complete the process of receiving and amplifying the optical signal.

[0084] It is understandable that the number of amplifiers is not limited to three. Multiple amplifiers can be connected to achieve multi-stage amplification. The sampler is set at the output of the subsequent amplifier and fed back to the gain controller before the previous amplifier through the inter-stage coupling capacitor, thereby achieving synchronous gain adjustment. In particular, by setting different initial resistance values ​​for different gain controllers, different gain adjustments can be made for different amplifiers, thereby achieving discrete adjustment.

[0085] Example 5

[0086] In practical applications, it was found that the adaptive receiver amplifier circuit structure in Embodiment 1 adjusts the amplifier gain after the amplifier has already amplified the initial electrical signal. Therefore, the gain adjustment always lags behind the amplified signal, and a small segment of saturation distortion signal is still input to the subsequent unit. Therefore, the adaptive receiver amplifier circuit structure in Embodiment 5 sets up a transimpedance amplifier to directly pre-adjust the amplifier gain based on the strength of the initial electrical signal, thereby advancing the gain adjustment before the amplified signal and avoiding the occurrence of saturation distortion signal.

[0087] Please see Figure 5 This embodiment 5 provides an adaptive receiver amplifier circuit structure, including a photodetector 1, a transimpedance amplifier 6, a sampler 3, a comparator 4, an amplifier 2, and a gain controller 5.

[0088] The photoelectric receiver 1 continuously receives the initial light signal from the outside and converts the initial light signal into an initial electrical signal accordingly;

[0089] The transimpedance amplifier 6 is connected to the photodetector 1 and amplifies the initial electrical signal input from the photodetector 1 to obtain a transimpedance amplified signal.

[0090] The sampler 3 is connected to the transimpedance amplifier 6 and samples the transimpedance amplified signal to obtain a sampled signal;

[0091] The comparator 4 is connected to the sampler 3. The sampled signal enters the comparator 4. When the sampled signal is greater than a preset threshold in the comparator 4, the comparator 4 outputs a high-level trigger signal.

[0092] The gain controller 5 is connected to the comparator 4. The trigger signal is input into the gain controller 5, which reduces the resistance of the variable impedance element in the gain controller 5, thereby reducing the gain of the amplifier 2 and preventing the amplifier 2 from entering the saturation operating region.

[0093] The amplifier 2 is connected to the photodetector 1 and amplifies the initial electrical signal input from the photodetector 1 to obtain an amplified signal.

[0094] The post-amplifier unit is connected to amplifier 2, and the amplified signal is input to the post-amplifier unit to complete the process of receiving and amplifying the optical signal.

[0095] This invention uses a dynamic gain adjustment approach to ensure that the amplifier always operates in the linear region, effectively avoiding saturation distortion caused by strong signals and increasing the system's dynamic range. It also compensates for signal strength differences caused by distance differences, increasing the amplification factor of the far-end signal and thus improving the effective range of the far-end transmitting terminal.

[0096] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. An adaptive receiver amplifier circuit structure, characterized in that: include: The photoelectric receiver tube continuously receives the initial light signal from the outside world and converts the initial light signal into an initial electrical signal accordingly. At least one amplifier amplifies the initial electrical signal to obtain an amplified signal; The sampler samples the amplified signal to obtain a sampled signal; At least one comparator receives a sampled signal and outputs a trigger signal when the sampled signal is greater than a preset threshold. At least one gain controller receives a trigger signal and reduces the gain of the amplifier to bring the amplifier into the linear operating region.

2. The adaptive receiver amplifier circuit structure according to claim 1, characterized in that: It also includes a first comparator, a second comparator, and a third comparator, which are respectively connected to the sampler. The sampled signal enters each comparator. When the sampled signal is greater than a preset threshold in the corresponding comparator, the comparator issues a trigger signal. The thresholds of the first comparator, the second comparator, and the third comparator are set to low threshold, medium threshold, and high threshold in ascending order.

3. The adaptive receiver amplifier circuit structure according to claim 2, characterized in that: The gain controller is connected to the first comparator, the second comparator, and the third comparator respectively. When the trigger signal of the first comparator is input into the gain controller, the gain controller reduces the gain of the amplifier by 10dB; when the trigger signal of the second comparator is input into the gain controller, the gain controller reduces the gain of the amplifier by 20dB; and when the trigger signal of the third comparator is input into the gain controller, the gain controller reduces the gain of the amplifier by 30dB.

4. The adaptive receiver amplifier circuit structure according to claim 1, characterized in that: It also includes a first-stage amplifier and a second-stage amplifier; The first-stage amplifier is connected to the photodetector to amplify the initial electrical signal to obtain the first-stage amplified signal; The second-stage amplifier is connected to the first-stage amplifier to amplify the first-stage amplified signal to obtain the second-stage amplified signal; The sampler is connected to the second-stage amplifier and samples the second-stage amplified signal to obtain a sampled signal; The comparator receives a sampled signal from the sampler, and when the sampled signal is greater than a preset threshold in the comparator, the comparator outputs a trigger signal. The gain controller receives a trigger signal from the comparator and reduces the gain for the first-stage amplifier so that the first-stage amplifier is in the linear operating region.

5. The adaptive receiver amplifier circuit structure according to claim 1, characterized in that: It also includes a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a first gain controller, a second gain controller, and a third gain controller; The first-stage amplifier is connected to the photodetector to amplify the initial electrical signal to obtain the first-stage amplified signal; The second-stage amplifier is connected to the first-stage amplifier to amplify the first-stage amplified signal to obtain the second-stage amplified signal; The third-stage amplifier is connected to the second-stage amplifier to amplify the second-stage amplified signal to obtain the third-stage amplified signal; The sampler is connected to the third-stage amplifier and samples the third-stage amplified signal to obtain a sampled signal; The comparator receives a sampled signal from the sampler, and when the sampled signal is greater than a preset threshold in the comparator, the comparator outputs a trigger signal. The first gain controller receives a trigger signal from the comparator and reduces the gain for the first stage amplifier to make the first stage amplifier operate in the linear region; the second gain controller receives a trigger signal from the comparator and reduces the gain for the second stage amplifier to make the second stage amplifier operate in the linear region; the third gain controller receives a trigger signal from the comparator and reduces the gain for the third stage amplifier to make the third stage amplifier operate in the linear region.

6. The adaptive receiver amplifier circuit structure according to claim 5, characterized in that: The initial gains of the first gain controller, the second gain controller, and the third gain controller are different.

7. The adaptive receiver amplifier circuit structure according to claim 6, characterized in that: The sampler is connected to the preamplifier via an interstage coupling capacitor.

8. The adaptive receiver amplifier circuit structure according to claim 1, characterized in that: It includes a photodetector, transimpedance amplifier, sampler, comparator, amplifier, and gain controller; The photoelectric receiver continuously receives the initial light signal from the outside world and converts the initial light signal into an initial electrical signal accordingly. The transimpedance amplifier is connected to the photodetector to amplify the initial electrical signal to obtain the transimpedance amplified signal; The sampler is connected to the transimpedance amplifier and samples the transimpedance amplified signal to obtain a sampled signal; The comparator receives a sampled signal from the sampler, and when the sampled signal is greater than a preset threshold in the comparator, the comparator outputs a trigger signal. The gain controller receives a trigger signal from the comparator and reduces the gain of the amplifier to bring the amplifier into the linear operating region. The amplifier is connected to the photodetector tube to amplify the initial electrical signal to obtain an amplified signal.

9. The adaptive receiver amplifier circuit structure according to any one of claims 1-8, characterized in that: The gain controller uses a variable impedance element whose resistance decreases as the voltage across it increases.

10. The adaptive receiver amplifier circuit structure according to claim 9, characterized in that: The amplified signal is an analog signal, and the sampled signal is a digital signal.

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