CN-224205055-U - Adaptive gain control circuit and signal processing equipment

CN224205055UCN 224205055 UCN224205055 UCN 224205055UCN-224205055-U

Abstract

The utility model relates to the technical field of communication, and provides a self-adaptive gain control circuit and signal processing equipment, which are used for solving the problem that a controllable noise suppression module of the self-adaptive gain control circuit in the prior art mostly adopts a single filtering mode and cannot automatically adjust filtering strategies for different noise environments. The circuit and the device comprise a variable gain amplifying 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, the external upper computer and receives the feedback signal of the output end of the controllable noise suppression module through the power divider. The logic control module can accurately regulate and control gain coefficients and filtering bandwidths by receiving and analyzing the external upper computer instructions, so that the fine management of the signal processing process is realized, and the flexibility and adaptability of the signal processing are improved.

Inventors

Zhou Leli
ZHANG SEN

Assignees

成都华创电科信息技术有限公司

Dates

Publication Date: 20260505
Application Date: 20250520

Claims (5)

1. An adaptive gain control circuit, comprising: The input end of the variable gain amplifying module is used for receiving an external input signal; The input end of the controllable noise suppression module is connected with the output end of the variable gain amplification module; The output end M of the power divider is connected with an external follow-up circuit and can be used as an input signal of the external follow-up circuit; The device comprises a logic control module, an output end A of the logic control module, an output end B of the logic control module, an external upper computer, a gain coefficient of the variable gain amplification module and a filtering bandwidth of the controllable noise suppression module, wherein the input end B of the logic control module is connected with the output end N of the power divider, the output end A of the logic control module is connected with the control end of the variable gain amplification module, the output end B of the logic control module is connected with the control end of the controllable noise suppression module, and the input end B of the logic control module is connected with the external upper computer and used for receiving and analyzing instructions of the upper computer.
2. The adaptive gain control circuit of claim 1, wherein the controllable noise suppression module comprises: The input end of the data analysis sub-module is connected with the output end B of the logic control module; The input selection switch is provided with an input end, three output ends and a control end, wherein the three output ends are respectively OA, OB and OC; the control end of the input selection switch is connected with the output end OX of the data analysis submodule, and the input end of the input selection switch is connected with the output end of the variable gain amplification module; The input end of the low-pass filter is connected with the OA; the input end of the band-pass filter is connected with OB; the input end of the high-pass filter is connected with the OC; The output selection switch is provided with three input ends, namely Ia, ib and Ic, an output end and a control end, the output end of the output selection switch is connected with the input end of the power divider, and the control end of the output selection switch is connected with the output end OY of the data analysis submodule.
3. The adaptive gain control circuit of claim 1, wherein the variable gain amplification module employs a programmable gain amplifier chip of model AD 8337.
4. The adaptive gain control circuit of any one of claims 1-3, wherein the gain range of the variable gain amplification module is-11 dB to +31dB, the gain accuracy is ± 0.5dB, the bandwidth is up to 200MHz, and the digital gain control signal output by the logic control module is received through the SPI interface, so as to achieve accurate amplification of the external input signal.
5. A signal processing device comprising an adaptive gain control circuit as claimed in any one of claims 1 to 4.

Description

Adaptive gain control circuit and signal processing equipment Technical Field The present utility model relates to the field of communications technologies, and in particular, to an adaptive gain control circuit and a signal processing device. Background The self-adaptive gain control circuit is an electronic circuit capable of automatically adjusting gain according to the amplitude of an input signal or the state of a system, and has wide application in the fields of communication, signal processing, instruments, meters and the like. In the prior art, a controllable noise suppression module of the adaptive gain control circuit mostly adopts a single filtering mode, and a filtering strategy cannot be automatically adjusted for different noise environments, so that human intervention is needed. Disclosure of utility model The utility model provides a self-adaptive gain control circuit and signal processing equipment, which are used for solving the problem that a controllable noise suppression module of the self-adaptive gain control circuit in the prior art mostly adopts a single filtering mode and cannot automatically adjust filtering strategies for different noise environments. The technical scheme adopted by the utility model is as follows: An adaptive gain control circuit, comprising: The input end of the variable gain amplifying module is used for receiving an external input signal; The input end of the controllable noise suppression module is connected with the output end of the variable gain amplification module; The output end M of the power divider is connected with an external follow-up circuit and can be used as an input signal of the external follow-up circuit; The device comprises a logic control module, an output end A of the logic control module, an output end B of the logic control module, an external upper computer, a gain coefficient of the variable gain amplification module and a filtering bandwidth of the controllable noise suppression module, wherein the input end B of the logic control module is connected with the output end N of the power divider, the output end A of the logic control module is connected with the control end of the variable gain amplification module, the output end B of the logic control module is connected with the control end of the controllable noise suppression module, and the input end B of the logic control module is connected with the external upper computer and used for receiving and analyzing instructions of the upper computer. Further, the controllable noise suppression module includes: The input end of the data analysis sub-module is connected with the output end B of the logic control module; The input selection switch is provided with an input end, three output ends and a control end, wherein the three output ends are respectively OA, OB and OC; the control end of the input selection switch is connected with the output end OX of the data analysis submodule, and the input end of the input selection switch is connected with the output end of the variable gain amplification module; The input end of the low-pass filter is connected with the OA; the input end of the band-pass filter is connected with OB; the input end of the high-pass filter is connected with the OC; The output selection switch is provided with three input ends, namely Ia, ib and Ic, an output end and a control end, the output end of the output selection switch is connected with the input end of the power divider, and the control end of the output selection switch is connected with the output end OY of the data analysis submodule. Further, the variable gain amplification module adopts a programmable gain amplifier chip with the model of AD 8337. Further, the gain range of the variable gain amplification module is-11 dB to +31dB, the gain precision is +/-0.5 dB, the bandwidth reaches 200MHz, and the digital gain control signal output by the logic control module is received through the SPI interface, so that the accurate amplification of an external input signal is realized. Based on the same inventive concept, the present utility model also provides a signal processing apparatus comprising the aforementioned adaptive gain control circuit. The beneficial effects of the utility model are as follows: In the self-adaptive gain control circuit and the signal processing equipment disclosed by the utility model, a logic control module is connected to the control end of a controllable noise suppression module, the control end of a variable gain amplification module, an external upper computer and receives an output end feedback signal of the controllable noise suppression module through a power divider. The logic control module can accurately regulate and control gain coefficients and filtering bandwidths by receiving and analyzing the external upper computer instructions, so that the fine management of the signal processing process is realized, and the flexibility and adaptability of the signal process