Preceding-stage processing circuit based on broadband vibration signal

CN120200562APending Publication Date: 2025-06-24HARBIN INST OF TECH
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Patent Information

Application Number
CN202510208728.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-25
Publication Date
2025-06-24

AI Technical Summary

Technical Problem

When facing a complex vibration environment with wide band and multiple amplitudes, the traditional fixed gain amplification and single-band filtering design is limited in dynamic range, insufficient anti-interference ability and single adaptability, resulting in signal distortion or missed detection.

Method used

A pre-processing circuit based on dynamic adjustment gain and frequency-dividing filtering is designed, and a high-precision programmable gain amplifier is used to realize dynamic gain switching, combining multi-mode signal routing and fast analog switches to realize dynamic routing and frequency-dividing filtering of signals.

Benefits of technology

This circuit can automatically adapt to the input signal amplitude, eliminate saturation distortion of traditional fixed gain circuits under strong signals, improve processing capabilities for wide-band vibration signals, suppress multiple interference signals, and realize strict real-time signal processing.

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Abstract

The invention provides a preceding-stage processing circuit based on broadband vibration signals, belongs to the technical field of broadband vibration signal acquisition and processing, and solves the problems of limited dynamic range, insufficient anti-interference capability and single adaptability caused by traditional fixed gain amplification and single-frequency-band filtering design. Comprising a dynamic adjustment gain link, a first multi-mode signal routing link, a frequency-division filtering link and a second multi-mode signal routing link which are connected in sequence. In the dynamic gain adjustment link, the amplitude characteristic of an input signal is continuously monitored by utilizing the self-adaption of a high-precision programmable gain amplifier to the amplitude of the signal, so that the measurement precision is improved, in the frequency division filtering link, low-frequency filtering and medium-high-frequency filtering are included, pre-filtering and common-mode rejection of an input stage are combined, the noise power can be better reduced, and the signal-to-noise ratio can be better improved; and the anti-interference capability of the system is enhanced.
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