Patent ID: 6949937

Claim:
A circuit, capable of evaluating small variations in magnitude of capacitance within a differential capacitor arrangement forming a transducer and thus apt for real-time evaluating and measuring said differential capacitive transducers with high sensitivity and great noise immunity, implemented as a pair of sensor capacitors, connected normally to the two input terminals of said circuit and delivering a precise and stable output signal as result of said measurement to its output terminals, comprising: capacitive sensor elements or transducers in form of capacitors, connected to input terminals of evaluation means and designated as transducer capacitors; means for evaluating said small variations in magnitude of capacitance in real-time and thus measuring said capacitive sensor elements, delivering output signals as result of said measurement and consisting of some means for charging and discharging said transducer capacitors with charges delivered by appropriate supply voltages, means for transferring and exchanging said charges implemented in form of a switching network, and means for transforming said transferred and applicatively exchanged charges into voltages equivalent to said output signals implemented within read-out system; means for internal intermediate storage of electrical energy, assembled as a four-pole (two-port) circuit exhibiting two input and two output terminals; and amplifier stages connected to said output terminals of said means for internal intermediate storage of electrical energy, delivering a boosted output signal at the output terminals of the circuit.