A 39 µW body channel communication wake-up receiver with injection-locking ring-oscillator for wireless body area network

An ultra-low power wake-up receiver for body channel communication (BCC) is implemented in 0.13 μm CMOS process. The proposed wake-up receiver uses the injection-locking ring-oscillator (ILRO) to replace the RF amplifier with low power consumption. Through the ILRO, the frequency modulated input signal is converted to the full swing rectangular signal which is directly demodulated by the following low power PLL based FSK demodulator. In addition, the relaxed sensitivity and selectivity requirement by the good channel quality of the BCC reduces the power consumption of the receiver. As a result, the proposed wake-up receiver achieves a sensitivity of -55.2 dbm at a data rate of 200 kbps while consuming only 39 μW from the 0.7 V supply.