An ultra-low-power wake-up receiver with voltage-multiplying self-mixer and interferer-enhanced sensitivity

A 0.5V self-mixer-first 550MHz 220nW wake-up receiver in 0.13um CMOS has a -56.4dBm sensitivity at 36.36kbps and an energy consumption of 6.1pJ/bit. A 10-stage voltagemultiplying self-mixer using MOS transistors in weak inversion consumes 2.7nW and offers multi-stage conversion gain at baseband. In the presence of a -43.5dBm PM interferer, the alternate 1.luW high frequency baseband path in the receiver offers an enhanced sensitivity of -63.6dBm.