A microwave Doherty amplifier with programmable bias control

This paper investigates the adaptive bias control of a microwave Doherty amplifier using a programmable logic device. The gate bias of the peaking amplifier is controlled by the magnitude of the envelope of the RF input signal, which is digitized by a logarithmic detector. Compared with a class C peaking amplifier the peak output power at the 1 dB… CONTINUE READING