High sensitivity pressure switch
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United States of America Patent
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-
Nov 2, 2004
Grant Date -
Feb 6, 2003
app pub date -
Aug 2, 2001
filing date -
Aug 2, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for use in respiration type apparatus using a piezoresistive transducer and wherein the temperature effects on system stabilization are minimized and system initialization times are reduced. The circuit comprises a differential sensor amplifier response to the output of the piezoresistive transducer, a dc negative feedback circuit connected to the output of the differential amplifier, an initialization circuit for reducing the initialization time of the circuit, a diode clamp and voltage follower for clamping the voltage output and a voltage comparator for tracking the circuit operating point and switching its output state when a sudden voltage change caused by a patient breath is detected.
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