Signal acquisition system of photoelectric detector

By introducing a passive high-pass filter into the photodetector signal acquisition system, the problems of signal-to-noise ratio degradation and noise gain peak in the existing technology are solved, thereby improving system stability and dynamic range.

CN121540281APending Publication Date: 2026-02-17ZHEJIANG QIZHEN QUANTUM TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511742328.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-25
Publication Date
2026-02-17

AI Technical Summary

Technical Problem

Existing photodetector signal acquisition systems struggle to balance dynamic range utilization, anti-saturation robustness, and system resource consumption under strong background and wide dynamic range conditions, leading to decreased signal-to-noise ratio and noise gain peaks, thus affecting system stability.

Method used

A passive high-pass filter is introduced between the transimpedance preamplifier circuit and the voltage postamplifier circuit. By coordinating the circuit structure and parameters of each stage, noise gain peaks are suppressed, and system stability is improved.

Benefits of technology

It effectively suppresses noise gain peaks, improves system stability, enhances signal-to-noise ratio and dynamic range utilization, reduces noise propagation, and ensures fast response and anti-saturation capability.

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Abstract

The invention provides a signal acquisition system of a photoelectric detector. In the signal acquisition system, a transimpedance pre-amplification circuit is arranged at the output end of the photoelectric detector, and a passive high-pass filter circuit is connected between the transimpedance pre-amplification circuit and a post-voltage amplification circuit. And a feedback network is formed in the transimpedance pre-amplification circuit and is used for converting a current signal output by the photoelectric detector into a proportional first voltage signal and outputting the proportional first voltage signal. The filter circuit is a third-order LC high-pass filter circuit and is used for suppressing direct current, low frequency and self-beat frequency components and keeping a 10-90MHz pass band flat. The rear voltage amplification circuit adopts a voltage amplification structure of a voltage operational amplifier, the voltage gain Av is 6-10, and the super-band gain is limited through a shunt capacitor. According to the embodiment of the invention, through the structure and parameter setting, the noise gain peak value is suppressed, and the system stability is improved.
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