capacitive sensor interface circuit

Details capacitive sensor interface circuit capacitive sensor interface circuit

1996-10-28

1998-05-12

Brock, Michael

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

7351432, G01P 15125

Patent

active

057511543

ABSTRACT:
In a switched-capacitor type interface circuit connected to a capacitive sensor having two capacitors (C1, C2) whose value is variable, the interface circuit includes an operational amplifier (A1) with an output terminal and an inverting input terminal between which a feedback/sampling capacitor (C3) is connected, and a holding capacitor (C4) connected between the operational amplifier (A1) and a reference voltage source. The capacitors (C1, C2, C3) have one ends connected to the inverting input terminal of the operational amplifier (A1). The other ends of the capacitors (C1, C2) are connected to a power source and the capacitor (C3) is concurrently short-circuited depending upon predetermined timing, and the other ends of the and capacitors (C1, C2) and the output terminal of the operational amplifier (A1) are respectively connected to a non-inverting input terminal of the operational amplifier (A1) after the elapse of a predetermined time from the predetermined timing.

REFERENCES:
patent: 5429736 (1995-07-01), Shimada et al.
patent: 5612494 (1997-03-01), Shibano
"An ASIC for High-Resoilution Capacitive Microaccelerometerss", Sensors and Actuators, A21-A23, pp. 278-281, 1990.

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