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A Photovoltaic-Driven and Energy-Autonomous CMOS Implantable Sensor

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4 Author(s)
Sahar Ayazian ; ECE Department, University of Texas at Austin, Austin, TX, USA ; Vahid A. Akhavan ; Eric Soenen ; Arjang Hassibi

An energy-autonomous, photovoltaic (PV)-driven and MRI-compatible CMOS implantable sensor is presented. On-chip P+/N-well diode arrays are used as CMOS-compatible PV cells to harvest μW's of power from the light that penetrates into the tissue. In this 2.5 mm × 2.5 mm sub-μW integrated system, the in-vivo physiological signals are first measured by using a subthreshold ring oscillator-based sensor, the acquired data is then modulated into a frequency-shift keying (FSK) signal, and finally transmitted neuromorphically to the skin surface by using a pair of polarized electrodes.

Published in:

IEEE Transactions on Biomedical Circuits and Systems  (Volume:6 ,  Issue: 4 )