Micro-current measurement method
A measurement method and micro-current technology, applied in the direction of measurement device, measurement of electrical variables, measurement of current/voltage, etc., to achieve the effect of improving the signal-to-noise ratio
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[0020] The specific embodiments of the present invention will be further described below in conjunction with the drawings.
[0021] Weak signal detection is to filter out the interference signal from the signal source, enhance and restore the useful signal to be measured to the maximum extent, improve the signal-to-noise ratio (SNR), and effectively suppress noise is the difficulty and key point of the micro-current measurement. According to the types and characteristics of noise, there are two main sources: 1) inherent noise from the electronic system, including the bias current and offset voltage of the op amp, the thermal noise generated by the heating of electronic components, and the impulse noise generated by the interference of digital circuits. Spike noise generated by the switching circuit, etc.; 2) From outside the electronic system, such as power frequency interference, radio frequency noise, atmospheric noise, mechanical noise, etc. In the measurement, the processing ...
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