A 184-nW, −78.3-dBm Sensitivity Antenna-Coupled Supply, Temperature, and Interference-Robust Wake-Up Receiver at 4.9 GHz

This article presents a highly integrated, supply, temperature, and interference-robust, event-driven wake-up receiver (WuRx) achieving $< -78.3$ -dBm sensitivity using a custom-designed antenna at 4.9 GHz or $< -72.3$ -dBm sensitivity when matched to a 50- $\Omega $ source at 5.3 GHz, consuming 184 nW at room temperature. The chip is fabricated in 65-nm CMOS LP technology and powered by a single supply. A novel slot antenna is proposed to directly conjugate match to the input of the chip and eliminate lossy impedance matching networks. The integrated references and regulation enable the receiver to operate for a wide range of temperatures from $-30\,\,^\circ \text{C}$ to 70 $^\circ \text{C}$ and a supply range from 1.2 to 1.5 V. The integrated proportional–integral–derivative (PID) control module allows the WuRx to automatically adapt for different temperatures and interference signals present in the ambient environment.