Self-adaptive gain control circuit and signal processing equipment

Abstract

The utility model relates to the technical field of communication, and provides a self-adaptive gain control circuit and signal processing equipment in order to solve the problems that a controllable noise suppression module of a self-adaptive gain control circuit in the prior art mostly adopts a single filtering mode, and filtering strategies cannot be automatically adjusted for different noise environments. The circuit and equipment comprise a variable gain amplification module, a controllable noise suppression module, a power divider and a logic control module. The logic control module is connected to the control end of the controllable noise suppression module, the control end of the variable gain amplification module and an external upper computer, and receives feedback signals of the output end of the controllable noise suppression module through the power divider. The logic control module can precisely regulate and control the gain coefficient and the filtering bandwidth by receiving and analyzing an external upper computer instruction, fine management of the signal processing process is achieved, and the flexibility and adaptability of signal processing are improved.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, and in particular to an adaptive gain control circuit and signal processing device. Background Technology

[0002] Adaptive gain control circuits are electronic circuits that can automatically adjust the gain according to the amplitude of the input signal or the system state. They are widely used in communication, signal processing, instrumentation and other fields.

[0003] In existing technologies, the controllable noise suppression module of adaptive gain control circuits mostly adopts a single filtering method, which cannot automatically adjust the filtering strategy for different noise environments and requires human intervention. Utility Model Content

[0004] This invention addresses the problem that existing adaptive gain control circuits often employ a single filtering method in their controllable noise suppression modules, which cannot automatically adjust the filtering strategy for different noise environments. It provides an adaptive gain control circuit and signal processing device.

[0005] The technical solution adopted in this utility model is:

[0006] An adaptive gain control circuit includes:

[0007] The variable gain amplifier module has its input terminal used to receive external input signals.

[0008] A controllable noise suppression module, the input of which is connected to the output of a variable gain amplifier module;

[0009] The power divider's input terminal is connected to the output terminal of the controllable noise suppression module; the power divider's output terminal M is connected to external subsequent circuits and can be used as the input signal for external subsequent circuits.

[0010] The logic control module has its input terminal b connected to the output terminal N of the power divider; its output terminal A connected to the control terminal of the variable gain amplifier module; its output terminal B connected to the control terminal of the controllable noise suppression module; and its input terminal b connected to an external host computer to receive and parse instructions from the host computer, and to adjust the gain coefficient of the variable gain amplifier module and the filtering bandwidth of the controllable noise suppression module.

[0011] Furthermore, the controllable noise suppression module includes:

[0012] The data parsing submodule has its input connected to the output B of the logic control module.

[0013] The input selection switch has one input terminal, three output terminals, and one control terminal. The three output terminals are OA, OB, and OC. The control terminal of the input selection switch is connected to the output terminal OX of the data parsing submodule. The input terminal of the input selection switch is connected to the output terminal of the variable gain amplifier module.

[0014] A low-pass filter, the input of which is connected to OA;

[0015] A bandpass filter, the input of which is connected to OB;

[0016] A high-pass filter, the input of which is connected to the OC.

[0017] The output selection switch has three input terminals, one output terminal, and one control terminal. The three input terminals are Ia, Ib, and Ic. The output terminal of the output selection switch is connected to the input terminal of the power divider. The control terminal of the output selection switch is connected to the output terminal OY of the data parsing submodule.

[0018] Furthermore, the variable gain amplification module uses a programmable gain amplifier chip of model AD8337.

[0019] Furthermore, the variable gain amplifier module has a gain range of -11dB to +31dB, a gain accuracy of ±0.5dB, and a bandwidth of 200MHz. It receives the digital gain control signal output by the logic control module through the SPI interface to achieve precise amplification of external input signals.

[0020] Based on the same inventive concept, this utility model also provides a signal processing device, which includes the aforementioned adaptive gain control circuit.

[0021] The beneficial effects of this utility model are:

[0022] In the adaptive gain control circuit and signal processing device disclosed in this utility model, the logic control module is connected to the control terminal of the controllable noise suppression module, the control terminal of the variable gain amplification module, and an external host computer, and receives the output feedback signal of the controllable noise suppression module through a power divider. By receiving and parsing instructions from the external host computer, the logic control module can precisely adjust the gain coefficient and filtering bandwidth, achieving refined management of the signal processing process and improving the flexibility and adaptability of signal processing. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 Here is the overall block diagram of the adaptive gain control circuit;

[0025] Figure 2 This is a block diagram of the controllable noise suppression module. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0028] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0029] The adaptive gain control circuit disclosed in this embodiment includes the following components: a variable gain amplification module 1, a controllable noise suppression module 2, a power divider 3, and a logic control module 4. Based on the complete structure of the adaptive gain control circuit, this embodiment also provides an external input circuit 5, an external subsequent circuit 6, and a host computer 7. (See attached diagram) Figure 1 As shown.

[0030] The input terminal of the variable gain amplifier module 1 is used to receive the external input signal from the external input circuit 5;

[0031] The input terminal of the controllable noise suppression module 2 is connected to the output terminal of the variable gain amplifier module 1;

[0032] The input terminal of the power divider 3 is connected to the output terminal of the controllable noise suppression module 2; the output terminal M of the power divider 3 is connected to the external subsequent circuit 6 and can be used as the input signal of the external subsequent circuit 6.

[0033] The input terminal b of the logic control module 4 is connected to the output terminal N of the power divider 3; the output terminal A of the logic control module 4 is connected to the control terminal of the variable gain amplifier module 1; the output terminal B of the logic control module 4 is connected to the control terminal of the controllable noise suppression module 2; the input terminal b of the logic control module 4 is connected to the external host computer 7, which is used to receive and parse the instructions of the host computer 7, and adjust the gain coefficient of the variable gain amplifier module 1 and the filtering bandwidth of the controllable noise suppression module 2.

[0034] The working principle of the above technical solution is as follows:

[0035] The variable gain amplifier module 1 receives and amplifies the external input signal from the external input circuit 5, and outputs the amplified signal into the controllable noise suppression module 2. The controllable noise suppression module 2 outputs the noise-canceled signal into the power divider 3. The power divider 3 splits the signal into two paths (both have the same waveform), one path enters the external subsequent circuit 6, and the other path enters the logic control module 4. The host computer 7 sends a gain control command (which includes information about the signal gain coefficient) or a filter band selection command (which includes the filter band range; the user determines which frequency of noise needs to be filtered based on the noise frequency of the environment where the adaptive gain control circuit is located) to the logic control module 4. The logic control module 4 receives and parses the command sent by the host computer 7, and determines whether the command sent by the host computer 7 is information about the signal gain coefficient or a filter band selection command.

[0036] If the instruction sent by the host computer 7 is information about the signal gain coefficient, the logic control module 4 sends a gain control instruction to the variable gain amplifier module 1 to control the signal gain coefficient.

[0037] If the instruction sent by the host computer 7 is a filter band selection instruction, the logic control module 4 sends a filter band selection instruction to the controllable noise suppression module 2 to determine which frequency of noise needs to be filtered out.

[0038] The beneficial effects of the above technical solution are as follows: the logic control module 4 is connected to the control terminal of the controllable noise suppression module 2, the control terminal of the variable gain amplification module 1, and the external host computer 7, and receives the feedback signal from the output terminal of the controllable noise suppression module 2 through the power divider 3. By receiving and parsing the instructions from the external host computer 7, the logic control module 4 can precisely adjust the gain coefficient and filtering bandwidth, realize refined management of the signal processing process, and improve the flexibility and adaptability of signal processing.

[0039] Specifically, the controllable noise suppression module 2 includes the following components: a data parsing submodule 21, an input selection switch 22, a low-pass filter 231, a band-pass filter 232, a high-pass filter 233, and an output selection switch 24. (See attached diagram) Figure 2 As shown.

[0040] The input terminal of the data parsing submodule 21 is connected to the output terminal B of the logic control module 4;

[0041] The input selection switch 22 has one input terminal, three output terminals, and one control terminal. The three output terminals are OA, OB, and OC, respectively. The control terminal of the input selection switch 22 is connected to the output terminal OX of the data parsing submodule 21. The input terminal of the input selection switch 22 is connected to the output terminal of the variable gain amplifier module 1.

[0042] The input of the low-pass filter 231 is connected to OA;

[0043] The input of the bandpass filter 232 is connected to OB;

[0044] The input of the high-pass filter 233 is connected to the OC.

[0045] The output selection switch 24 has three input terminals, one output terminal, and one control terminal. The three input terminals are Ia, Ib, and Ic, respectively. The output terminal of the output selection switch 24 is connected to the input terminal of the power divider 3. The control terminal of the output selection switch 24 is connected to the output terminal OY of the data parsing submodule 21.

[0046] The working principle of the controllable noise suppression module 2 is as follows:

[0047] The logic control module 4 sends a filter band selection command to the data parsing submodule 21. After parsing the command, the data parsing submodule 21 controls the selection path of the input selection switch 22 through the output terminal OX. The input terminal of the input selection switch 22 receives the signal output by the variable gain amplifier module 1. If OX controls the input selection switch 22 to select OA, the signal enters the low-pass filter 231; if OB is selected, it enters the band-pass filter 232; if OC is selected, it enters the high-pass filter 233. After being processed by the corresponding filters, the signals are input to the Ia, Ib, and Ic terminals of the output selection switch 24, respectively. At this time, the data parsing submodule 21 controls the output selection switch 24 through the output terminal OY to select the output signal of the corresponding filter (if Ia is selected, the signal processed by the low-pass filter 231 is output; if Ib is selected, the signal processed by the band-pass filter 232 is output; if Ic is selected, the signal processed by the high-pass filter 233 is output), and finally sends the signal with specific frequency noise filtered out to the power divider 3. Thus, by controlling the input and output selection switches 24 through the data parsing submodule 21, targeted suppression of noise at different frequencies can be achieved, meeting diverse filtering needs.

[0048] The beneficial effects of the above technical solution are as follows: the logic control module 4 receives and analyzes the instructions from the host computer 7, and precisely controls the gain coefficient of the variable gain amplifier module 1 and the filtering bandwidth of the controllable noise suppression module 2. The controllable noise suppression module 2, through the input / output selection switch 24 and low-pass, band-pass, and high-pass filters 233, can specifically suppress noise at specific frequencies. This design achieves refined signal processing management, improves flexibility and adaptability, enables the circuit to better adapt to different environments, optimizes signal processing effects, and enhances the overall system performance.

[0049] Furthermore, the variable gain amplifier module 1 uses a programmable gain amplifier chip of model AD8337, with a gain range of -11dB to +31dB, a gain accuracy of ±0.5dB, and a bandwidth of 200MHz. It receives the digital gain control signal output by the logic control module 4 through the SPI interface to achieve precise amplification of external input signals.

[0050] The beneficial effects of the above technical solution are as follows: Using the AD8337 programmable gain amplifier chip as the variable gain amplification module 1, its wide gain range of -11dB to +31dB and high-precision control of ±0.5dB can accurately match input signals of different intensities, significantly reducing the risk of signal distortion. This is particularly suitable for scenarios with stringent accuracy requirements, such as bioelectrical signal acquisition in medical equipment and adaptive receiving front-ends in communication systems. The 200MHz broadband characteristic supports high-speed signal processing, meeting the needs of high-frequency applications such as 5G communication and radar detection, effectively expanding the circuit's applicability. The SPI digital interface design not only enhances the anti-interference capability of gain settings but also supports seamless integration with microcontrollers, enabling automated gain adjustment and accelerating system response. Furthermore, the chip's low-power characteristics (35mA operating current) and single-chip integrated design reduce the number of external components, lower system power consumption and size, and optimize the battery life and reliability of portable devices.

[0051] Based on the same inventive concept, this embodiment also provides a signal processing device, including the aforementioned adaptive gain control circuit.

Claims

1. An adaptive gain control circuit, characterized in that, include: The variable gain amplifier module has its input terminal used to receive external input signals. A controllable noise suppression module, the input of which is connected to the output of a variable gain amplifier module; The power divider's input terminal is connected to the output terminal of the controllable noise suppression module; the power divider's output terminal M is connected to external subsequent circuits and can be used as the input signal for external subsequent circuits. The logic control module has its input terminal b connected to the output terminal N of the power divider; its output terminal A connected to the control terminal of the variable gain amplifier module; its output terminal B connected to the control terminal of the controllable noise suppression module; and its input terminal b connected to an external host computer to receive and parse instructions from the host computer, and to adjust the gain coefficient of the variable gain amplifier module and the filtering bandwidth of the controllable noise suppression module.

2. The adaptive gain control circuit according to claim 1, characterized in that, The controllable noise suppression module includes: The data parsing submodule has its input connected to the output B of the logic control module. The input selection switch has one input terminal, three output terminals, and one control terminal. The three output terminals are OA, OB, and OC. The control terminal of the input selection switch is connected to the output terminal OX of the data parsing submodule. The input terminal of the input selection switch is connected to the output terminal of the variable gain amplifier module. A low-pass filter, the input of which is connected to OA; A bandpass filter, the input of which is connected to OB; A high-pass filter, the input of which is connected to the OC (open circuit). The output selection switch has three input terminals, one output terminal, and one control terminal. The three input terminals are Ia, Ib, and Ic. The output terminal of the output selection switch is connected to the input terminal of the power divider. The control terminal of the output selection switch is connected to the output terminal OY of the data parsing submodule.

3. The adaptive gain control circuit according to claim 1, characterized in that, The variable gain amplifier module uses a programmable gain amplifier chip of model AD8337.

4. The adaptive gain control circuit according to any one of claims 1-3, characterized in that, The variable gain amplifier module has a gain range of -11dB to +31dB, a gain accuracy of ±0.5dB, and a bandwidth of 200MHz. It receives digital gain control signals from the logic control module via the SPI interface to achieve precise amplification of external input signals.

5. A signal processing device, characterized in that, Includes the adaptive gain control circuit as described in any one of claims 1-4.

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