IEEE Microwave and Wireless Components Letters ( IF 2.310 ) Pub Date : 2019-11-28 , DOI: 10.1109/lmwc.2019.2952007
Liang Chen; Lei Zhang; Yan Wang

This letter presents a novel compact power amplifier (PA) using the transformer-based quadrature coupler as the power splitter and combiner to achieve a large output power and high gain for automotive radar application. Compared with conventional transmission-line-based power splitter and combiner, the transformer-based quadrature coupler offers a low loss, wide bandwidth, and compact footprint. As a proof of concept, a 77-GHz PA is designed and implemented in a 65-nm CMOS technology. The measured small-signal power gain is 26.4 dB with a 8.5-GHz 3-dB bandwidth from 74 to 82.5 GHz. The measured $P_{\text {sat}}$ , OP 1 dB , and peak power added efficiency (PAE) are 15.82, 11.5 dBm, and 15.9%, respectively. In addition, the saturated output power at 77 GHz is 16.5 dBm at −40 °C and still remains as high as 13.5 dBm at 130 °C, which enables the automotive application. The proposed PA occupies a core area of $270\,\,\mu \text{m}\,\,\times 530\,\,\mu \text{m}$ and the total dc power consumption is 240 mW.

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