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A wake-up receiver (WuRX) that achieves −80.5-dBm sensitivity with only 6.1 nW of power is presented. High sensitivity is achieved via a passive pseudo-balun envelope detector (ED) with a high input impedance ( pF) that enables a 30.6-dB passive voltage gain transformer while providing differential output and improving the conversion gain by compared to a conventional single-ended input passive ED for a given input capacitance. The WuRX is implemented in a 180-nm CMOS process and operates from a 0.4-V supply.