A 21.56dBm four-way current-combining power amplifier for Ka-band applications in 65-nm CMOS

[摘要] This paper presents a four-way current-combining Ka-band power amplifier (PA) in 65-nm CMOS technology. A symmetrical, transmission line based four-way current combiner, together with output transformers, is used to transfer the high load impedance (4*ZL) to the desired Zopt for each power unit cell. Besides, both interstage/input flexible matching transformers and the power splitter are optimized to improve the performance. Based on the methodology mentioned above, the power amplifier demonstrates a small-signal gain of about 24.12 dB, a saturated output power of 21.56 dBm, and a peak power-added efficiency of 27.3% at 35GHz.

[学科分类] 电子、光学、磁材料

[关键词] four-way current-combining;power amplifier;transmission line based combiner;flexible transformer