Signal detection system

Abstract

The invention discloses a signal detection system. The signal detection system comprises a front-end processing module used for receiving a to-be-detected signal, carrying out voltage division, amplification and filtering processing on the to-be-detected signal and outputting the processed signal, a reference signal processing module used for receiving a reference signal, carrying out shaping, phase shift and comparison processing on the reference signal to generate a square wave signal and outputting the square wave signal, a phase-sensitive detection module used for receiving the to-be-detected signal outputted by the front-end processing module and the square wave signal outputted by the reference signal processing module, carrying out phase-sensitive detection on the to-be-detected signal according to the square wave signal to generate a phase-sensitive detection signal and then outputting the phase-sensitive detection signal, a back-end processing module used for receiving the phase-sensitive detection signal, carrying out filtering and amplification processing on the phase-sensitive detection signal and then outputting the processed phase-sensitive detection signal, and a sampling module used for carrying out sampling quantification for the phase-sensitive detection signal outputted by the back-end processing module after processing to acquire an amplitude value of the phase-sensitive detection signal.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a technology for detecting weak signals based on an analog multiplier. Background technique [0002] Most of the signals in nature are analog signals, including light, sound, pressure, heat, etc. It is impossible for such signals to be processed by the processor, and they must be converted by sensors to convert them into If the electrical signal that is easy to analyze and process is processed, if the original signal is very weak, the generated electrical signal will also be very weak, generally at the microvolt level. In order to detect weak signals of this level, most of the existing technologies use high-precision and high-bit analog-to-digital converter (Analog To Digital Converter, ADC) chips for direct sampling. This detection method has relatively high requirements for equipment precision and cost. , It is necessary to use sophisticated detection equipment to col...

AI Technical Summary

Problems solved by technology

In order to detect weak signals of this level, most of the existing technologies use high-precision and high-bit analog-to-digital converter (Analog To Digital Converter, ADC) chips for direct sampling. This detection method has relatively high requirements for equipment precision and cost. , it is necessary to use sophisticated detection equipment to collect such a weak electrical signal

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