• A K/Ka-band series Doherty PA with a distributed impedance inverting network achieves wideband linearity and power back-off efficiency enhancement.
• Implemented in 65 nm CMOS, the PA delivers a 3 dB bandwidth of 15.5 GHz with a peak gain of 21.2 dB at 34.2 GHz.
• Under 1-V supply, it achieves OP1dB >13.4 dBm and Psat >16 dBm from 21 to 30 GHz, with peak PAE of 28.2% and 6-dB PBO PAE of 13.2%.
• Without DPD or equalization, the PA meets stringent EVM requirements for high-order modulated signals, including −25.2 dB for 200 MHz 64-QAM and −20 dB for 2 GHz 16-QAM at 27 GHz.