Patent ID: 8536948
Filing Date: 2013-09-17
Classification: H01P,H03F

Abstract:
1. A power amplifier for amplifying an input signal and outputting the amplified input signal as an output signal, the power amplifier comprising: a first transformer for matching input impedance and dividing the input signal into a plurality of split signals, the first transformer having a first metal line in an annular shape as a primary winding to which the input signal is inputted, and a plurality of second metal lines as a plurality of secondary windings; a plurality of push-pull amplifiers, each push-pull amplifier including a pair of transistors for amplifying one of the plurality of split signals; and a second transformer having a third metal line in an annular shape as a secondary winding from which the output signal is outputted, and a plurality of fourth metal lines as primary windings, for combining the plurality of split signals amplified by the plurality of push-pull amplifiers to output the output signal and matching output impedance, wherein two input terminals of the pair of transistors are connected to each other via one of the second metal lines, and two output terminals of the pair of transistors are connected to each other via one of the fourth metal lines.