Patent ID: 6980057
Filing Date: 2005-12-27
Classification: H03F

Abstract:
1. A power amplifier for amplifying a high frequency signal, the amplifier comprising: a first amplification element for amplifying a first signal; a second amplification element for amplifying a second signal in reverse phase with respect to the first signal, wherein the second amplification element is connected to the first amplification element in a push-pull configuration; a first distributed constant line having a line length for inverting a phase of a fundamental wave component of the first signal amplified by the first amplification element; a first resonant circuit connected between an output end of the second amplification element and a point on the first distributed constant line at which a phase of an even-ordered harmonic component desired to be canceled out is inverted, wherein the first resonant circuit series-resonates with a frequency of the even-ordered harmonic component desired to be canceled out; and an output terminal for outputting a combined signal obtained by combining a signal from the first distributed constant line with a signal from the second amplification element.