Analog Baseband Circuits for Low-power 802-11ba Wake-up Radio in 40-nm CMOS

The paper describes the analog baseband circuits for 802.11ba-compliant wake-up radios. A four-stage variable-ain amplifier provides up to 64-dB signal amplification, with a foreground offset cancellation, and it implements the anti-aliasing bandwidth limiting. A low-power Successive Approximation-Register A/D converter is used for the input signal digitization, with the high-frequency clock generated by a digital Delay Locked Loop. Implemented in a 40-nm CMOS technology, the analog baseband shows a very small silicon area of 0.063 mm(2) with an overall current consumption of 99 mu A.