A 10.2 Mbps Pulse Harmonic Modulation Based Transceiver for Implantable Medical Devices Farzad Inanlou,S t u d e n tM e m b e r ,I E E E, Mehdi Kiani , Student Member , IEEE ,a n d

Abstract

A low power wireless transceiver has been presented for near- field data transmission across inductive telemetry links, which operates based on pulse h armonic modulation (PHM). This PHM transceiver uses on-off keying (OOK) of a pattern of pulses to suppress inter-symbol in terference (ISI), and its charac- teristics are suitable for low-pow er high-bandwidth telemetry in implantable neuroprosthetic devi ces. To transmit each bit across a pair of high-Q LC-tank circuits, the PHM transmitter generates a string of narrow pulses with speci fic amplitudes and timing. Each pulse generates a decaying oscilla tion at the harmonic frequency that the receiver LC-tank is tuned at, which is then superimposed with other oscillations across the receiver at the same frequency, to minimize the ISI. This allow s for reaching high data rates without reducing the inductive link quality factor (to extend its bandwidth), which signi ficantly improves the range and selectivity of the link. The PHM receiver ar chitecture is based on non-co- herent energy detection with p rogrammable bandwidth and adjustable gain. The PHM transc eiver was fabricated in a 0.5- m standard CMOS process, occupying 1.8 mm . The transceiver achieved a measured 10.2 Mbps data rate with a bit error rate (BER) of at 1 cm distance using planar implant sized (1 cm ) figure-8 coils. The PHM transmitter power consumption was 345 pJ/bit and 8.85 pJ/bit at 1 cm and zero link distances, respectively. The receiver dissi pates 3 mW at 3