Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-02-08
1991-06-18
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307269, 307263, 307582, 328182, 328185, H03K 500, H03K 513
Patent
active
050251724
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 tuned 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: 3621281 (1971-11-01), Hagen
patent: 3879683 (1975-04-01), Bosselaers
patent: 4282549 (1981-08-01), Balaban et al.
patent: 4322636 (1930-03-01), Schroder
patent: 4717848 (1988-01-01), Rabaey et al.
Carroll Kenneth J.
Pless Benjamin D.
Miller Stanley D.
Roseen Richard
Ventritex, Inc.
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