Inhalation transducer circuit with DC drift compensation
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United States of America Patent
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Jul 22, 1986
Grant Date -
N/A
app pub date -
Sep 7, 1982
filing date -
Sep 7, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An inhalation transducer circuit is provided for use with a transducer having a variable electrical output. Early amplifier stages provide very high gain, and are subsequently a.c. coupled to stages of lesser gain leading to a microprocessor and an output. An electronic switch is connected to the a.c. coupling circuit, and when no breathing is being measured and there is no output to the amplification circuit this switch is periodically closed to connect a reference voltage to the a.c. coupling, and thus to compensate for any DC drift in the transducer and early amplification stages.
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