Realization of Proper Load Modulation Using a Real Transistor
Abstract
Various techniques for compensating the nonideal operation of the Doherty amplifier related to the transistor characteristics are discussed. For the proper load modulation of the Doherty amplifier, the transconductance of the peaking amplifier should be two times larger than that of the carrier amplifier. This problem can be solved by the uneven input power drive, 6 dB more input drive to the peaking amplifier. For the same purpose, the gate bias of the peaking amplifier can be adapted. The load modulation can be deviated from the ideal operation due to the knee voltage effect of a transistor and the large input capacitance variation of the class-C-biased peaking ...
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