Patent ID: 7193472
Filing Date: 2007-03-20
Classification: H03F,H05K

Abstract:
1. A power amplifier comprising: a divider circuit having an input end, a first branch, and a second branch for dividing an input signal received through the input end into a first input signal and a second input signal; a first amplifier circuit including a first impedance conversion circuit having an input end thereof connected to an output end of the first output higher harmonic load control circuit of the first amplifier circuit, and having an electrical length equivalent to one-quarter of the wavelength of an output signal from the first output higher harmonic load control circuit; a second impedance conversion circuit having an input end thereof connected to the second branch, and imparting a phase difference, which offsets a phase difference to be imparted by the first impedance conversion circuit, to the second input signal from the second branch; a second amplifier circuit including a combiner circuit having a third branch, a fourth branch, and an output end through which a third output signal is issued, the third branch being connected to an output end of the first impedance conversion circuit, and the fourth branch being connected to an output end of the second output higher harmonic load control circuit.