Measurement coupling for low capacitances

Details Measurement coupling for low capacitances Measurement coupling for low capacitances

G - Physics

01

R

324/44

G01R 27/26 (2006.01)

Patent

CA 2035909

(57) Abstract Coupling for measurement of low capacitances (C1,C2,C3). The coupling comprises an oscil- lator, such as an LC or RC oscilllator, whose output frequency (fo) is a function of the capaci- tance to be measured and connected between the input terminal (16) of the oscillator and the ground. The capacitances (C1,C2,C3) to be meas- ured are connected alternatingly to the input terminal (16) of the oscillator. With the excep tion of the capacitance to be connected between the input terminal (16) of the oscillator and the ground for measurement, the other capacitances to be measured are connected, by one of their terminals, to a wire (19) common of the capaci- tances (C1,C2,C3) to be measured and, by the other one of their terminals, to the output of the voltage follower. The input of the voltage fol- lower is connected to the input terminal (16) of the oscillator coupling. The voltage follower consists of an operation amplifier (20), whose output is connected to its inverting input, to which the capacitances (C2,C3) that are not be- ing measured are connected so that there are no voltage differences and, consequently, no charg- ing currents in their terminals.

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