A 28GHz High Efficiency Inverse Class-F Series Doherty Power Amplifier

This paper presents a differential series Doherty power amplifier (PA) in a $45-\mathrm{nm}$ SOI CMOS process. The amplifier utilizes class-$\mathrm{F}^{-1}$ main and auxiliary amplifiers with dynamic biasing for $26-30\mathrm{GHz}$ frequency band. Simulation results show that with a supply voltage of $2.2\mathrm{~V}$, the PA achieves a small signal gain of $11.1\mathrm{~dB}$ at 28GHz, a saturated output power ($P_{\text{sat}})$ of 25.9dBm, an output 1-dB compression $(O_{1\mathrm{~dB}})$ of 24.7dBm, a power added efficiency (PAE) at peak and at $6\mathrm{~dB}$ output power back-off (PBO) of $ 38.3{\%}$ and $ 27.3{\%}$, respectively.