Resistance-bridge to frequency converter with automatic offset correction
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United States of America Patent
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-
Oct 20, 1981
Grant Date -
N/A
app pub date -
Sep 28, 1979
filing date -
Sep 28, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for converting changes in a sensed physical parameter, such as resistance and resistance change as a function of pressure, temperature and the like, into a digital signal of proportional frequency. A sensor bridge, monitoring the parameter to be measured, forms a part of a feedback loop controlling a current into a resistance-capacitance integrator which is part of a controlled oscillator. The oscillator has automatic offset error correction. The frequency of the sensor-controlled is proportional to the unbalance in the sensor bridge. The converter receives power on a two-wire line from a power supply which may be located remotely therefrom, and from which power supply the sensed-parameter-established frequency is extracted for use by processing-control apparatus and the like.
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