Implantable cardiac defibrillator employing a switched capacitor

Details Implantable cardiac defibrillator employing a switched capacitor Implantable cardiac defibrillator employing a switched capacitor

1990-04-06

1991-02-05

Jaworski, Francis

Surgery

Truss

Pad

A61N 100

Patent

active

049896032

ABSTRACT:
An implantable cardiac defibrillator employing a switched capacitor filter stage having charge steering resistors connected in series with corresponding switched capacitors that are coupled to a sensitive node of an operational amplifier. The stored channel charges in associated switches when they are turned off are directed away from the sensitive node. The switches associated with the switched capacitors are operated by control signals having a generally trapezoidal shaped waveform so as to slowly turn off the same, thereby reducing clock feedthrough and charge injection induced offset voltage on the output of the operational amplifier.

REFERENCES:
patent: 4375817 (1983-03-01), Engle
patent: 4595009 (1986-06-01), Leinders
patent: 4596252 (1986-06-01), Nelson
patent: 4693253 (1987-09-01), Adams
Wegmann et al., "Charge Injection in Analog MOS Switches", ISSCC, vol. SC-22, No. 6, 12-1978, pp. 1091-1097.
"High-Resolution Switched-Capacitor D/A Converter", Gregorian, Microelectronics Journal, vol. 12, No. 2, 1981, pp. 10-13.

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