Importance

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Abstract

A telemetry system for use in an implantable device that communicates with an external programmer, includes a coil, a timing circuit connected to the coil, and a coil driver circuit that reverts at least part of the expanded energy back to the power source. The timing circuit generates two control signals SC1 and SC2, and is comprised of four switches S1, S2, S3, S4 that are connected across the power source and the coil, and that are selectively energized by the control signals SC1 and SC2. The control signal SC1 energizes switches S1 and S4 to close, with the switches S2 and S3 open, causing the coil to become a load across the power source and to store energy therefrom. Upon the expiration of the control signal SC1, the control signal SC2 triggers switches S2 and S3 to close with the switches S1 and S4 open, causing the coil to discharge the stored energy through the power source, charging it.

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First Claim