This paper presents a power-efficient phased-array transmit and receive (T/R) channels adopting phase shifters(PSs) utilizing quadrature-hybrid-based power-domain phase interpolator. The W-band T/R channels are implemented in Global-Foundries 0.13-mu m SiGe BiCMOS process (GF8XP) for large-scale phased-array applications. At 94 GHz, the proposed Rx channel achieves 137-dB center dot Hz dynamic range (DR) with 18-mW dc power consumption (P-diss), one of the smallest P-dis s at W-band. The measured Rx channel gain is 17-23 dB with 5.8-6.6-dB noise figure (NF) over 92-98 GHz. The rms gain error and rms phase error in the Rx channel are less than 2 dB and 6 degrees, respectively, at 92-100 GHz. The input P-1dB is -31 dBm at 94 GHz. The Tx channel produces 7.4-dBm saturated output power with 49.5-mW Pdiss at 94 GHz resulting in 11% of collector efficiency, one of the highest Tx channel efficiencies reported so far. The Pdiss at quiescent bias point of the Tx channel is 26 mW. The measured Tx channel gain is 7.5-12 dB and the rms gain error is <1.28 dB over 85-105 GHz. The measured rms phase error in the Tx channel is < 1.5 degrees at 94 GHz and remains lower than 8 degrees when driving the Tx channel up to near the power saturation. The peak collector efficiency and PAE of the integrated class-AB power amplifier is 23.5% and 18.2%, respectively, at 94 GHz, one of the highest efficiency performances at W-band. The chip sizes of the Rx and Tx channels excluding I/O pads are 1.2 x 0.55 mm(2) and 1.4 x 0.55 mm(2), respectively.
