Patent ID: 7539468
Filing Date: 2009-05-26
Classification: H03G

Abstract:
1. A communication terminal apparatus comprising: an antenna configured to receive transmission power control information for controlling a transmission power of a transmission signal; a power amplifier including at least a variable gain amplifier configured to amplify and output said transmission signal in accordance with the transmission power control information received by said antenna, and a fixed gain amplifier including a main current mirror circuit and configured to amplify and output the transmission signal from the variable gain amplifier, the main current mirror circuit including a first main current mirror transistor and a second main current mirror transistor, and the second main current mirror transistor is configured to conduct current based on an amount of current conducted by the first main current mirror transistor; a power supply configured to supply an electric power to the variable gain amplifier and the fixed gain amplifier of said power amplifier, the supplied electric power including a constant supply current; an electric energy varying unit configured to conduct a first portion of the constant supply current from said power supply to ground and a second portion of the constant supply current to the main current mirror circuit based on the transmission power control information to vary an amount of the electric power provided to the fixed gain amplifier, the electric energy varying unit including a transmitter configured to transmit said transmission signal amplified by said power amplifier.