Apparatus for processing sensor signals having switch-capacitor

Details Apparatus for processing sensor signals having switch-capacitor Apparatus for processing sensor signals having switch-capacitor

1990-11-21

1993-05-11

Strecker, Gerard R.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324607, 324678, 324704, 73862628, G01R 2702, G01L 122

Patent

active

052105016

ABSTRACT:
The arrangement serves to process sensor signals furnished by a sensor which when fed with a supply signal in response to the action of a physical measured quantity. The sensor generates a measuring effect representing the dependence of an electrical characteristic quantity on the physical measured quantity. The arrangement also includes a signal processing circuit which operates by the principle of quantized charge transport by means of switch-capacitor structures. The signal processing circuit establishes a charge balance by opposite integration of measuring charge packets dependent on the measuring effect and compensation charge packets independent of the measuring effect and furnishes an analog output signal corresponding to the integration result. The analog output signal also provides a feedback input to the sensor. By this feedback the analog output signal is regulated so that it is proportional to the measurement result.

REFERENCES:
patent: 4366874 (1983-01-01), Pidoux et al.
patent: 4814692 (1989-03-01), Baumann
patent: 4816745 (1989-03-01), Schneider
patent: 4878012 (1989-10-01), Schule et al.
"A Switched-Capacitor Charge-Balancing Analog-to-Digital Converter and Its Application to Capacitance Measurement", IEEE Transactions on Instrumentation and Measurement, vol. IM-36, No. 4, pp. 873-878, Dec. 1987, Matsumoto et al.
"Precision integrator resets as it samples", Electronics, vol. 45, pp. 78-79, Aug. 1972, Knowlton.

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