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A self-tuning digital telemetry IC for use in a microprocessor-based implantable instrument

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4 Author(s)
Fernald, K.W. ; Intermedics Inc., Angleton, TX, USA ; Paulos, J.J. ; Stackhouse, B.A. ; Heaton, R.A.

An implantable digital telemetry integrated circuit that uses an automatic resonant-frequency search technique to adapt to antenna variations is presented. A VCO and an amplitude detector are used to search for the antenna's resonant frequency at the start of each transmission. The chip is designed to meet the communication requirements of a microprocessor-based telemetry system for the fast prototyping of implantable instruments for biomedical research applications. A full implementation of the telemetry IC, measuring 2.5 mm×2.9 mm, was fabricated in a 1.2 μm low-voltage CMOS process and tested with good results

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:27 ,  Issue: 12 )