Detection circuit for measuring tiny differential capacitance
A technology for detecting circuits and tiny capacitors, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as being unsuitable for high-precision capacitance detection and affecting detection accuracy, and achieve easy integration and mass production. , the circuit structure is simple, the effect of small temperature drift
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[0031] The principle of the invention is as figure 1 As shown, the component capacitance C of the differential capacitance to be measured x1 , C x2 The two frequency selection circuits are respectively connected as the capacitance link in the frequency selection circuit. When the differential capacitor to be tested has a common terminal and only three plates, the common electrode can be used as the single-point ground terminal of the two frequency selection circuits. The frequency selection circuit and the phase-locked loop together constitute a resonant unit. In this invention, the structures of the two resonant units are the same, and the first resonant unit is taken as an example for illustration.
[0032] Connect the output terminal F1 of the phase-locked loop to the port A1, and the voltage U VCO1 As the input of the frequency selection circuit; and connect the phase-locked loop output terminal F1 and the phase-locked loop input terminal C1, the voltage U VCO1 At the ...
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