Wideband high power high efficiency linear GaN power amplifier for cognitive radio application

This paper describes a linear, high efficient, high power push-pull GaN amplifier in the VHF-UHF band. This PA shows an efficiency of 60-55% from 10 MHz to 650 MHz, for an output power of 100W and a compressed gain of 19,5 +/-1.5 dB. By reducing the drain voltage to 30V, the efficiency is 70-60 with an output power of 47 dBm and a power gain of 18,5 +/-1.5 dB. Moreover, the measured EVM is less than 2% for an efficiency about 40% and an output power from 0 dBm to 45 dBm using a 64-QAM modulation at 50V. Nevertheless, the record efficiency of 60% have been measured on a 3pi/8 PSK (EDGE) digital modulation with an EVM <; 2.5%, for a tunable output power from 42 to 48 dBm.