Analysis and Design of a Multi-Mode Wake-Up Receiver Based on Direct Envelope Detection in Wireless Sensor Networks

In this paper, a multi-mode ultra-low power wake-up receiver based on direct envelope detection in HF/UHF band is analyzed and presented. Narrow-band LC matching network with passive voltage gain, active common source envelope detector with high conversion gain and baseband modules with signal amplification are clarified, separately. In order to balance the power consumption and sensitivity, multi-mode with power detection (PD), signal detection (SD), and high sensitivity signal detection (HSSD) are adopted. The PD mode is used to monitor the incident radio power, while in SD/HSSD modes, the wakeup sequences of 100/10 kb/s are detected with different power consumption and sensitivity. The presented wake-up receiver prototype is fabricated in a 95-nm CMOS process with an area of 0.6*0.3 mm2. Measurement results show that the wake-up receiver achieves a sensitivity of -45/-42 dBm, -43/-40 dBm and -58/-55 dBm while dissipating 120 nW, 600 nW, and 1 μW in PD mode, SD mode, and HSSD mode, respectively, while working in the HF/UHF band, separately.