Differential type capacitive sensor system

Details Differential type capacitive sensor system Differential type capacitive sensor system

1995-11-28

1997-05-27

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324684, 324685, 324678, 7351432, 73724, G01R 2726

Patent

active

056335946

ABSTRACT:
In a capacitive sensor system, first and second driving signals opposite in phase are applied to a sensor capacitor and a reference capacitor, respectively, which are both connected to a switched capacitor circuit. An output signal of the switched capacitor is sampled by two sample-and-hold circuits which are operated in different phases of the driving signals. A differential amplifier generates a sensor signal in response to the difference in potential between the outputs of the sample-and-hold circuits.

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F.V. Schnatz et al.; "Smart CMOS Capacitive Pressure Transducer with on-chip Calibration Capability"; Sensors and Actuators--A Physical A34(1992), Jul. No. 1, Lausanne, CH, pp. 77-83.

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