An Interference-Resilient BLE-Compatible Wake-Up Receiver Employing Single-Die Multi-Channel FBAR-Based Filtering and a 4-D Wake-Up Signature

• Published in: IEEE journal of solid-state circuits Vol. 56; no. 2; pp. 416 - 426
• Main Authors: Wang, Po-Han Peter, Mercier, Patrick P.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Advertising; Back-channel (BC) communication; Bluetooth; Bluetooth low energy (BLE); CMOS; Filtration; Frequency shift keying; Interference; low-power wireless; mixer-first receiver; Receivers; Resilience; Sensitivity; Synchronization; thin-film bulk acoustic-wave resonator (FBAR); wake-up radios; wake-up receivers (WuRXs)
• ISSN: 0018-9200; 1558-173X
• DOI: 10.1109/JSSC.2020.3012892

This article presents a Bluetooth low energy (BLE) compatible wake-up receiver (WuRX) that simultaneously achieves low power, high sensitivity, and interference resiliency. Interference resilience is achieved by detecting a 4-D wake-up signature based on the hopping pattern from BLE-compliant advertising events, while low power and high sensitivity are achieved by filtering each advertising channel via a single-die three-channel FBAR filter and down-converting packet energy via a designed integer-<inline-formula> <tex-math notation="LaTeX">N </tex-math></inline-formula> frequency plan. Implemented in 65 nm CMOS, the proposed WuRX achieves a sensitivity of −85 dBm and a signal-to-interference ratio (SIR) of −60 dB while consuming 220 <inline-formula> <tex-math notation="LaTeX">\mu \text{W} </tex-math></inline-formula> from a 0.5 V supply.