Patent ID: 6847258

Claim:
A power amplifier comprising: a splitting circuit splitting a signal of a frequency of a modulated wave into two; a first amplifying element having its input connected to one output of said splitting circuit; a second amplifying element having its input connected to the other output of said splitting circuit; a combining circuit combining an output of said first amplifying element with an output of said second amplifying element to output a composite signal; a first filter having one end connected to the output of said first amplifying element, said first filter not allowing the signal of the frequency of the modulated wave to pass therethrough and allowing a signal of a frequency band of a modulating wave of the signal of the frequency of the modulated wave to pass therethrough; a second filter having one end connected to the output of said second amplifying element, said second filter not allowing the signal of the frequency of the modulated wave to pass therethrough and allowing the signal of the frequency band of the modulating wave of the signal of the frequency of the modulated wave to pass therethrough; and an phase inverting circuit connected between the other end of said first filter and the other end of said second filter, said phase inverting circuit allowing the signal of the frequency band of the modulating wave to pass therethrough while inverting a phase of the signal of the frequency of the modulating wave.