Single-stage, high efficiency, 26-watt power amplifier using SiC LE-MESFET

This paper describes a single-stage 26 W negative feedback power amplifier, covering the frequency range 200-500 MHz using a 6 mm gate width SiC lateral epitaxy MESFET. Typical results at 50 V drain bias for the whole band are, around 22 dB power gain, around 43 dBm output power, minimum power added efficiency at P_{1 dB} is 47% at 200 MHz and maximum 60% at 500 MHz and the IMD3 level at 10 dB back-off from P_{1 dB} is below -45 dBc. The results at 60 V drain bias at 500 MHz are, 24.9 dB power gain, 44.15 dBm output power (26 W) and 66% PAE.