| 摘要 |
PROBLEM TO BE SOLVED: To provide a power amplifier module including a bias current control circuit for a mobile communication terminal, which hardly increase the chip size and power consumption. SOLUTION: The power amplifier for the mobile communication terminal includes a transistor Q1 for amplification, a bias circuit 101 and a bias current control circuit 103, the transistor Q1 for amplification generates an output signal of the mobile communication terminal, and the bias circuit 101 includes transistors Q2 and Q3 for bias and outputs a bias current for biasing the transistor Q1 for amplification. In accordance with a control signal, the bias current control circuit 103 adjusts a bias current to control an operating current of the transistor for amplification, and the control signal is determined by a power level of the output signal of the mobile communication terminal. When the output power level is low, the bias current control circuit 103 decreases the bias current and the operating current of the transistor for amplification so that the power addition efficiency is improved as a result. COPYRIGHT: (C)2004,JPO
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