Patent ID: 6940292

Claim:
A circuit configuration for a capacitive sensor, which configuration comprises: a first measuring capacitor (K M1 ) of variable capacitance discharged to a predeterminable residual charge and having a variable capacitance, which is set by means of a physical, measured quantity (p) to be detected, a first reference capacitor (K Ref1 ) carrying a reference charge, and a first buffer amplifier (OV 1 ), of which an input is coupled at least temporarily with the first measuring capacitor (K M1 ) such that an output of the first buffer amplifier (OV 1 ) delivers a first signal voltage, which is essentially proportional to a measured voltage occurring on the first measuring capacitor (K M1 ), wherein input and output of the first buffer amplifier (OV 1 ) are coupled during operation temporarily together via the first reference capacitor (K Ref1 ) such that the reference charge of the first reference capacitor (K Ref1 ) is transferred as completely as possible onto the first measuring capacitor (K M1 ).