An ultra-low power wake-up receiver for body channel communication (BCC) is implemented in 0.13μm 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

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... t 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 -55.2dbm at a data rate of 200kbps while consuming only 39μW from the 0.7V supply. I. INTRODUCTION Recently, wireless body-area-network (WBAN) is getting more attention due to the emerging applications to nextgeneration healthcare and entertainment [1]. The major design challenge associated with the WBAN is to extend the lifetime of the WBAN devices under limited energy source. Since one of the most power-consuming parts in the WBAN devices is the wireless transceiver, the body channel communication (BCC) which uses the human body as a communication channel is suggested for the low power wireless transceiver [2]- [4] . The BCC uses the low frequency band (30 -120 MHz) and electrode rather than the low impedance antenna. Therefore, the BCC has been energy efficient solution for WBAN. In the BCC as well as other communication method such as narrow band (NB) or ultra wide band (UWB) communication, the transceiver should be heavily duty-cycled in order to reduce the energy consumption. The usage of the wake-up receiver is possible solution for the efficient dutycycled communication. Without the wake-up receiver, each transceiver periodically monitors the channel to listen for potential incoming wake-up signal, which increases the overall power consumption of the WBAN system and communication latency. The wake-up receiver continuously monitors the channel for requests and activates the