A 27.9-mW 802.15.4/4z 1T2R Transceiver With FIR-Embedded Quadrature Hybrid Correlation and AoA Localization

This article presents an IEEE 802.15.4/4z ultrawideband (UWB) transceiver architecture that employs a finite-impulse response (FIR)-embedded quadrature hybrid correlation (QHC) method for low power and multipath mitigation. Like a rake receiver, the proposed analog correlator shifts a code instead of a UWB signal with FIR taps to relax the design complexity of an equalizer in the analog correlation. As a result, the power consumption for each FIR tap is reduced by more than ten times. A least-square-error-based FIR algorithm is proposed for the multipath mitigation of a burst position modulation (BPM) signal. To validate the proposed FIR-embedded QHC method, an 8-GHz 1T2R transceiver is implemented in 65-nm CMOS. The transceiver supports synchronization, BPM at 0.98/7.8 Mbaud/s, and precise localization. The receiver achieves −102-dBm sensitivity and consumes 12.2 mW/channel, while the FIR circuits consume 5.3% only. The chip supports localization with an rms time-of-arrival (ToA) error of 1.5 cm and an rms angle-of-arrival (AoA) error of 3.8°. With the duty-cycled operation, the transceiver consumes 27.9 mW at 0.98 Mbaud/s in the payload field and features the lowest power consumption among HRP-capable UWB transceivers.