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

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-N 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 μW from a 0.5 V supply.