Implantable medical device with adjustable sigma-delta...

Details Implantable medical device with adjustable sigma-delta... Implantable medical device with adjustable sigma-delta...

2008-03-18

2008-03-18

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

07345607

ABSTRACT:
An implantable medical device, such as a pacemaker or implantable cardioverter defibrillator, uses digital signal processing channels to process sensed time varying signals representing cardiac activity. Each digital signal processing channels includes a sigma-Delta analog-to-digital converter. The clock rate of each sigma-delta analog-to-digital converter is controlled as a function of a signal detection threshold for its respective digital signal processing channel. For higher threshold levels, a reduced clock rate for the sigma-delta analog-to-digital converter results in reduced power consumption and longer battery life.

REFERENCES:
patent: 6389315 (2002-05-01), Schu et al.
patent: 6556859 (2003-04-01), Wohlgemuth et al.

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