Differential capacitance detection circuit based on sampling holder demodulation
A sample-and-hold, differential capacitor technology, applied in capacitance measurement, measurement of resistance/reactance/impedance, and transmission of sensing components using electromagnetic/magnetic devices, etc., can solve the problems of amplified amplitude gain loss, etc. Conducive to miniaturization and the effect of saving operational amplifiers
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[0014] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0015] The present invention is a differential capacitance detection circuit based on demodulation of a sample-and-hold device. The variation of a pair of differential capacitances is detected by a modulation and demodulation method. The phase-sensitive demodulation circuit adopts a sample-and-hold d...
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