Patent ID: 8035444
Filing Date: 2011-10-11
Classification: H03F

Abstract:
1. An amplifier apparatus comprising: a carrier amplifier circuit having an amplifying element operable in class-AB or class-B; a plurality of peak amplifier circuits having amplifying elements operable in class-B or class-C, wherein an output of said carrier amplifier circuit and outputs of said plurality of peak amplifier circuits are combined for signal output; said plurality of peak amplifier circuits start to operate in stages in response to each input level thereof; a saturation output of a peak amplifier circuit of said plurality of peak amplifier circuits which starts to operate at a minimum input level is less than a saturation output of said carrier amplifier circuit; and a harmonic wave generation circuit having: a divider operative to divide for distribution an input signal of a basic frequency into basic wave signals, a harmonic generator operative to generate a secondary harmonic wave from one of the basic wave signals divided, an adjuster operative to adjust phase and amplitude of the secondary harmonic wave generated at said harmonic generator, and a combiner operative to combine together the phase/amplitude-adjusted secondary harmonic wave and a remaining one of said basic wave signals divided and then output a combined signal, wherein a secondary harmonic wave as output from said harmonic wave generation circuit is injected into an input signal of the carrier amplifier circuit and/or peak amplifier circuit.