Maximizing efficiency and linearitry

In, this paper, a detailed analysis of the optimum performance of various Doherty amplifier configurations in terms of output power, efficiency, and output power backoff ensuring a near-peak efficiency was presented. Closed-form design equations for the determination of the load R
_L
and impedance Z
_c
were derived for each configuration. An experimental realization at 1.9 GHz of a Doherty amplifier was presented. An efficiency of 43% was measured at 4 dB backoff from P
_1dB
of 27 dBm.