Input protection circuit for pacemaker activity sensor processin

Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems

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A61N 136

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active

055564208

ABSTRACT:
An improved input protection circuit for use in a circuit for processing sensor signals from a piezoelectric patient activity sensor is provided. The input protection circuit includes a field-effect transistor to prevent the voltage at an input terminal of the processing circuit from rising beyond a first predetermined voltage or falling below a second predetermined voltage. The gate and drain terminals of the transistor are connected to a first of two input terminals of the processing circuit and the source and body terminals are connected to the second terminal. When the voltage at the first terminal rises or falls sufficiently, the transistor conducts current, thereby preventing the voltage from rising or falling further.

REFERENCES:
patent: 4745923 (1988-05-01), Winstrom
patent: 5074302 (1991-12-01), Poore et al.
Hodges, David A. et al., Analysis and Design of Digital Integrated Circuits, pp. 45-47 (McGraw-Hill, New York-1988).

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