A 350 W, 790 to 960 MHz wideband LDMOS doherty amplifier using a modified combining scheme

A modified Doherty combining scheme is proposed that eases the impedance matching requirement and enables excellent AM/AM, AM/PM, and wide bandwidth in practical designs. A 350 W, 790 to 960 MHz symmetrical LDMOS Doherty amplifier measured 20 to 21 dB gain as well as peak and back-off efficiencies of 56% to 61% and 48% to 50% respectively across the band. The amplifier achieved excellent linearization results when driven with wideband 20 and 50 MHz WCDMA signals and a 35 MHz GMSK signal.