Transducer circuit having negative integral feedback
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United States of America Patent
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-
Jan 9, 1996
Grant Date -
N/A
app pub date -
Nov 3, 1992
filing date -
Nov 3, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transducer circuit which includes a Wheatstone bridge balanced by negative integral feedback. The bridge includes responsive elements formed on a thin resilent diaphragm. When subjected to a force, the diaphragm deflects and unbalances the bridge. The unbalanced bridge produces an output voltage which drives an integrator having an output voltage that is an integral of the bridge output voltage. The integrator output voltage is applied to the bridge as negative feedback to rebalance the bridge. The integrator includes a capacitor which introduces a time delay to assure that the feedback is always negative. The negative feedback provides stability for the circuit. The integrator output voltage drives indicating and/or auxiliary devices. The complete transducer circuit may be disposed within a sealed module having the diaphragm as a surface.
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