A Highly Reconfigurable Bit-Level Duty-Cycled TRF Receiver Achieving −106-dBm Sensitivity and 33-nW Average Power Consumption

This letter presents a reconfigurable wake-up receiver, which obtains -106-dBm sensitivity with power consumption as low as 33 nW. Bit-level duty cycling provides 68-dB RF gain at sub-$\mu \text{W}$ average power consumption, improving sensitivity over other sub-$\mu \text{W}$ receivers. The receiver rejects interference using a compact RF MEMS filter and a fully automatic gain and offset control loop. Digital tuning of dc power, latency, and sensitivity provides high levels of flexibility to enable a wide variety of applications, spanning latency from 240 ms to 5 s, dc power consumption from 288 nW to 33 nW, and sensitivity from -106 dBm to -103 dBm. Three example modes are presented to highlight the range of this tuning.