A–102-dBm Sensitivity Multichannel Heterodyne Wake-Up Receiver With Integrated ADPLL

This article presents a binary frequency-shift keying (BFSK) heterodyne wake-up receiver (WuRx) with -102-dBm sensitivity at 2.4 GHz. An integrated low-power all-digital phase-locked loop (ADPLL) allows sharp filtering at the intermediate frequency (IF) to improve sensitivity and interference robustness. The WuRx achieves an average current consumption of 2.2– $171~\mu $ A range at 16 s to 0.1-s latency with the packet-level-duty-cycling scheme. In addition, it supports up to 60 channels from 2.300 to 2.536 GHz. A signal-to-interference ratio (SIR) of -27/-30/-46 dB is achieved at 3/5/25-MHz offset from the carrier.