Signal processing circuit and electronic device

By combining charge amplifier circuit, non-inverting amplifier circuit, voltage-controlled filter circuit and hysteresis comparator circuit, the problems of high cost and common-mode noise in existing signal processing circuits are solved, and high-precision and fast signal conversion and output are achieved.

CN114362753BActive Publication Date: 2026-03-17RUIJIE NETWORKS CO LTD
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Patent Information

Application Number
CN202210050576.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-01-17
Publication Date
2026-03-17
Estimated Expiration
2042-01-17

AI Technical Summary

Technical Problem

Existing signal processing circuits are costly and suffer from significant common-mode noise when processing signals output from sensors, resulting in poor conversion performance.

Method used

By employing a combination of charge amplifier circuit, non-inverting amplifier circuit, voltage-controlled filter circuit, and hysteresis comparator circuit, and through differential structure and feedback unit design, common-mode noise is suppressed, and signal conversion accuracy and response speed are improved.

Benefits of technology

It effectively suppresses common-mode noise, improves signal conversion accuracy, has a fast response speed, produces a good square wave output signal, and reduces the impedance effect of the circuit.

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Abstract

This application provides a signal processing circuit and an electronic device. The signal processing circuit includes: a charge amplifier circuit for receiving a differential charge signal output from a sensor; amplifying and converting the differential charge signal to output a first voltage signal; a non-inverting amplifier circuit connected to the charge amplifier circuit for receiving the first voltage signal; amplifying the first voltage signal to output a second voltage signal; a voltage-controlled filter circuit connected to the non-inverting amplifier circuit for receiving the second voltage signal; amplifying and filtering the second voltage signal to output a third voltage signal; and a hysteresis comparator circuit connected to the voltage-controlled filter circuit for receiving the third voltage signal and comparing it to obtain a stable square wave signal. The solution provided in this application can effectively suppress common-mode noise signals, has a fast response speed, is less affected by circuit impedance, and produces a better square wave signal output.
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