Amplifying circuit particularly adapted for amplifying a biopotential input signal
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United States of America Patent
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-
Jun 14, 1988
Issued Date -
N/A
app pub date -
Dec 23, 1986
filing date -
Aug 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An amplifying circuit for amplifying a bipotential input signal, including an insulating housing having a conductive input contact mounted on the housing and adapted to engage a human body so that the bipotential input signal applied to the contact; a lead amplifier having inverting and non-inverting inputs, one of which is coupled to the input contact, and an output; first and second diodes connected in parallel inverse polarity across the inputs of the lead amplifier; third and fourth diodes connected in parallel inverse polarity from the inverting input of the lead amplifier to a circuit common potential; and an output resistor connected from the inverting input to the output of the lead amplifier. Portions of the input contact are surrounded by a voltage drive shield connected to the output of the lead amplifier.
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