Design of 0.9-2.6pW 0.1-0.25V 22nm 2-bit Supply-to-Digital Converter Using Always-Activated Supply-Controlled Oscillator and Supply-Dependent-Activation Buffers for Bio-Fuel-Cell-Powered-and-Sensed Time-Stamped Bio-Recording.

Hiroaki Kitaike, Hironori Tagawa, Shufan Xu, Ruilin Zhang, Kunyang Liu, Kiichi Niitsu

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