A Radio-Frequency Reconfigurable Cmos-Gan Class-E Chireix Power Amplifier

A new load-insensitive class-E power amplifier mode is presented that that enables frequency reconfigurability by statically changing the switch duty-cycle without compromising its tuned efficiency performance. The technique is tested on a prototype CMOS-GaN class-E Chireix power amplifier designed for 1.8-2.2 GHz. The drain efficiency is more than 55% at 8dB back-off and more than 60% at 6dB back-off across the band by reconfiguring the duty-cycle at each frequency via the pulse-width controlled CMOS drivers.