DATA AND POWER TELEMETRY FOR IMPLANTS

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Instructor: Maurits Ortmanns

Maurits Ortmanns received the Dipl.-Ing. in Electrical Engineering from Saarland University, Germany and the

Dr.-Ing. from IMTEK, University of Freiburg, Germany in 1999, and 2004, respectively. From 2004-2005 he was with

sciworx GmbH, Hannover, Germany as a project leader in mixed-signal electronics. From 2006-2007 he was Assistant

Professor for Integrated Interface Circuits at the University of Freiburg, Germany, and since 2008 he is full Professor

and Director of the Institute of Microelectronics at the University of Ulm, Ulm, Germany. His research interests

include mixed-signal integrated circuit design, self-correcting and reconfigurable analog circuits, with special

emphasis on data converters and biomedical applications. He served as program committee member of ESSCIRC,

DATE, ECCTD, ICECS, as Associate Editor of IEEE TCAS I, and is currently a program committee member of ISSCC.

He holds several patents, is coauthor of the book “Continuous-Time Sigma-Delta A/D Conversion”, and published

more than 120 IEEE journal and conference papers.

Power and data telemetry are mandatory components for all implantable systems. Especially multichannel recorders and stimulators require both large power and high data rates. Nonetheless, in many systems the telemetry is just implemented with a holistic approach, but not analyzed in large detail. Based on the fact that most implantable devices dissipate the largest amount of power in the telemetry subsystem, a careful design or even active adaptability of the link are thought necessary in order to provide high energy-efficiency as well as to meet with regulatory compliance. Still today, most systems use RF data telemetry and suffer from large power consumption. Power delivery is mostly done without feedback control, or batteries are employed. On the emerging side, power efficient data transfer using UWB or non-RF telemetry, such as optical or ultrasonic approaches have shown to be excellent alternatives. Feedback controlled power telemetry or energy harvesting systems have shown high efficiency. This tutorial will give an overview and design guidelines for high-efficiency data and power telemetry for implantable systems. It first reviews the common RF based approaches, and secondly highlights new approaches such as energy harvesting and non-RF communication.