Ultra-Low Power Wireless Sensor Network SoC for Biosignal Sensing Application in 65nm CMOS

This paper presents an ultra-low power bio-signal sensing system on chip (SoC) fabricated in a 65nm CMOS technology. The proposed SoC processes a selected bio-signal (i.e. ECG, EMG, ECoG, Neural spike, and EEG), and packetizes it, and transmits through an RF transmitter by means of On-Off Keying (OOK) modulation scheme. In standby mode, the SoC consumes only 912 nW, while it consumes 6.1 uW when fully operating, which can be achieved by an aggressive duty-cycling (i.e. 0.2526%). With a standard Lithium-ion AA-sized battery, the proposed SoC can operate for more than 50 years. When equipped with energy harvesting (e.g. Temperature gradients), the proposed SoC can maintain operation permanently.