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

Abstract

This paper 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 µA to 171 µA 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 GHz 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.INDEX TERMS All-digital phase-locked loop (ADPLL), Internet of Things (IoT), low-power, receivers, wake-up radios, wake-up receiver