Patent ID: 7711331
Filing Date: 2010-05-04
Classification: H03F

Abstract:
1. A transmission power amplifier apparatus comprising: a signal calculator for dividing an input signal into a plurality of N constant amplitude signals having a substantially identical predetermined constant amplitude value and having predetermined phases different from each other; N power amplifiers for amplifying electric powers of the N constant amplitude signals under same predetermined operating condition; a power combiner for combining the electric powers of the N power-amplified constant amplitude signals, and outputting a combined output signal; and a controller for controlling the signal calculator, (a) to detect an amplitude value of the input signal, (b) to detect an average value and one of a maximum value of the amplitude value of the input signal and a peak-to-peak value of the amplitude value for a unit time interval based on the detected amplitude value of the input signal, (c) to decide the constant amplitude value of the N constant amplitude signals for the unit time interval so as to suppress a combined loss caused by the power combiner based on the detected average value and one of the detected maximum value and the detected peak-to-peak value, (d) to decide the phases of the N constant amplitude signals so as to divide the input signal into the N constant amplitude signals having the decided constant amplitude value and the decided different phases based on the decided constant amplitude value and the amplitude value of the input signal, and (e) to divide the input signal into the N constant amplitude signals having the decided constant amplitude value and the decided different phases.