A 366 nW, −74.5 dBm Sensitivity Antenna-Coupled Wakeup Receiver at 4.9 GHz with Integrated Voltage Regulation and References

This paper describes a highly-integrated, supply-robust, event-driven wakeup receiver achieving <-74 dBm sensitivity using a custom antenna at 4.9 GHz or <-68 dBm sensitivity when matched to a 50 Ω source at 5.3 GHz, both across a supply voltage range from 1.2 V to 1.5 V while consuming 244 nA dc current in 65 nm CMOS technology. Voltage regulators, voltage and current references are all integrated on-chip operating from the same single battery supply. A novel slot antenna is proposed to directly match to the high impedance input of the envelope detector and eliminate losses associated with the bond-wire match.