Signal conditioning method and circuit based on linear phase front-end high-speed data collection

Abstract

The invention discloses a signal conditioning method and circuit based on linear phase front-end high-speed data collection. The circuit comprises a constant current source circuit, a low-pass filtering circuit, a first differential circuit, a digital determination circuit, an amplification circuit, a second differential circuit and a wavelet de-noising circuit; the digital determination circuit determines digital-analog conversion signals in double paths of differential signals; the wavelet de-noising circuit reduces a wavelet coefficient generated by de-noising and maintains a coefficient of real signals to the largest extent; and the constant current source circuit, the low-pass filtering circuit, the first differential circuit, the digital determination circuit, the amplification circuit, the second differential circuit and the wavelet de-noising circuit are connected sequentially. The method can be used to amplify, filter and process weak signals generated by a sensor, process the phase information more accurate and condition the weak signals; and the circuit can meet requirements for different parameters, satisfy occasions with higher requirement for signal phase via parameter adjustment, and is higher in using value.

Description

technical field [0001] The invention relates to the field of weak signal conditioning, in particular to a linear phase front-end high-speed data acquisition signal conditioning method and conditioning circuit. Background technique [0002] At home and abroad, there are many acquisition systems of corresponding types of sensors, but their anti-interference performance and signal anti-distortion effect are poor. The traditional front-end acquisition system has high noise, low precision and low sampling frequency. Moreover, the output signal often has problems such as temperature drift, weak signal, and nonlinearity, and cannot be directly used by the processing module. In particular, the traditional high-pass passive filter method has a great negative impact, and the filter frequency band will change with the load, which will reduce the stability of the entire acquisition system. Contents of the invention [0003] The purpose of the present invention is to aim at the defic...

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Problems solved by technology

[0002] At home and abroad, there are many corresponding types of sensor acquisition systems, but their anti-interference performance and signal anti-distortion effect are poor

The traditional front-end acquisition system has high noise, low precision and low sampling frequency

And the output signal often has problems such

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