Nonlinear Analysis and Design of a mm-wave Wideband Doherty Power Amplifier

Abstract

Abstract-This paper presents the design and nonlinear analysis of a mm-wave wideband Doherty power amplifier at 22 to 29GHz with 7GHz bandwidth, the design is done using 0.15µm GaAs PHEMT transistor to support a variety of mm-wave applications including point to point digital radio, LMDS/LMCS , ka-band satellite spacecraft and ISM applications. The wideband Doherty power amplifier provides greater than 21dBm of output power across 22-29 GHz, with a typical PAE of 35% and typical gain 15dB over the frequency range. The designed Doherty power amplifier also showed acceptable linearity when induced with two tone signal. Analysis results show that the Doherty power amplifier significantly improves both efficiency and linearity in power amplifier in comparison with the main amplifier.