21.7 A 1.8mW PLL-free channelized 2.4GHz ZigBee receiver utilizing fixed-LO temperature-compensated FBAR resonator

This paper presents an ultra-low-power 2.4GHz receiver for the IEEE 802.15.4 (ZigBee) standard. Traditional short-range ISM-band radios require a PLL-based frequency synthesizer for channelization across the band of interest [1-3]. The lowest ZigBee power consumption found in the literature to date is 1.6mW (RX) and 1.8mW (PLL) by employing a sliding-IF architecture [1]. [4] proposes a BAW-based 2.4GHz ZigBee receiver that saves power by eliminating the off-chip quartz crystal with super-high IF architecture; however, 8.2mW DC power is consumed since a low frequency LC-PLL is necessary for channel select tuning. The Blixer in [5] reduced the RX DC power through current re-use; however, the LO generator suffers from high power consumption due to the high-frequency quadrature LO.