A Photovoltaic-Driven and Energy-Autonomous CMOS Implantable Sensor


An energy-autonomous, photovoltaic (PV)-driven and MRI-compatible CMOS implantable sensor is presented. On-chip $Prm +/rm N$-well diode arrays are used as CMOS-compatible PV cells to harvest $mu$W's of power from the sunshine that penetrates into the tissue. In this two.5 mm$,times,$a pair of.5 mm sub-$mu$W integrated system, the in-vivo physiological signals are 1st measured by employing a subthreshold ring oscillator-primarily based sensor, the acquired information is then modulated into a frequency-shift keying (FSK) signal, and finally transmitted neuromorphically to the skin surface by using a try of polarized electrodes.

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