Singlechip-based low-frequency weak signal detector
A weak signal and weak signal amplification technology, applied in the field of signal processing, can solve the problems of high hardware requirements of weak signal detectors, high signal-to-noise ratio threshold of weak signals, and difficult maintenance, etc., and achieves good human-computer interaction and easy debugging. and maintenance, easy maintenance effect
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[0033] like figure 1 As shown, it is a complete structural block diagram of the present invention, including a weak signal amplification and preprocessing part and a digital processing part.
[0034] The weak signal amplification and preprocessing part includes: input filter module, buffer processing module, pre-amplification module, high-pass filter module, low-pass filter module, 50HZ notch filter and post-processing module. The unprocessed low-frequency weak signal first enters the input filter module for RFI interference purification processing; then it is sent to the buffer processing module to reduce the correlation between the pre-stage circuit and the subsequent amplification circuit; after buffer processing, the signal enters the pre-amplification module, Amplify the microvolt level signal to the millivolt level signal; since the capacitor DC blocking is not introduced before the first stage amplification, in order to prevent the...
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