High-precision weak signal tester and high-precision weak signal test method

Abstract

The present invention discloses a high-precision weak signal tester and a high-precision weak signal test method which are suitable for the signal analysis and processing, and belong to the signal detection and processing field. A weak signal is a current signal of which the frequency is 30 Hz or less, and the amplitude Ipp is 10 pA or less. The high-precision weak signal tester disclosed by the present invention comprises a prepositive current-voltage conversion circuit module, a first-stage amplification circuit module, a voltage follower circuit module, a second-stage amplification and low-pass filtering circuit module, a signal reverse amplification circuit module and a protection circuit module. The present invention also discloses the high-precision weak signal test method based on the tester. The high-precision weak signal tester and the high-precision weak signal test method provided by the present invention are high in precision, low in noise and cost and simple in operation, can detect the ultra-low frequency weak signals with the high precision to record the signals and process the data, thereby improving the signal detection and processing precision.

Description

technical field [0001] The invention relates to the field of signal detection and processing, in particular to a high-precision weak signal tester and a test method suitable for signal analysis and processing. Background technique [0002] The research on detection methods of weak signals under strong noise background environment is a comprehensive technical field in signal analysis and processing technology. Compared with the noise, the weak signal not only has a small amplitude voltage and a low signal-to-noise ratio, but also has a low frequency. In conventional signal measurement and processing, the detection signal voltage is large, the frequency of the signal is high, generally above 100Hz, and the signal-to-noise ratio is high. In actual signal detection, it is necessary to detect, analyze and identify ultra-low frequency weak signals submerged in noise with a frequency below 30 Hz and an amplitude current of pA level. In a strong noise background environment, it is...

AI Technical Summary

Problems solved by technology

[0003] Aiming at solving the problems of low detection accuracy, cumbersome detection methods and expensive instruments in current weak signal detection methods, the technical problem to be solved by the high-precision weak signal tester and test method disclosed by the present invention is: to provide a high-precision, low- Noise, simple operation, low-cost weak signal tester and test method can detect ultra-low frequency weak signals with high precision, so as to realize the recording and data processing of such signals, thereby improving the accuracy of signal detection and processing

Images