Circuit arrangement for temperature compensation of capacitive pressure and differential pressure sensors
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United States of America Patent
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-
Mar 19, 1991
Grant Date -
N/A
app pub date -
Sep 22, 1989
filing date -
Sep 24, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit arrangement for temperature compensation of capacitive pressure sensors and differential pressure sensors includes two measuring capacitors (1,2) which are arranged in respective feedback branches of two measuring integrators (3, 4). The capacitance values vary as a function of the pressure or differential pressure to be detected and are converted into measurement signals by the measuring interconnect. A negative feedback circuit is provided which comprises a Schmitt trigger circuit (5) which at least generates a temperature-dependent activation signal for the measuring integrators from a measurement signal.
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