| 摘要 |
PURPOSE: A power amplification bias circuit for a mobile communication terminal is provided to maintain a bias constantly without regard to temperature variation by using a transistor for performing a feedback of bias in a bias circuit. CONSTITUTION: A first transistor(Q1) performs a feedback of a bias permitted into a power amplifier. A second transistor(Q2) restricts bias variation in interlocking with the first transistor(Q1). A first power supply unit(V1) supplies a collector of the first transistor(Q1) and a base of the second transistor(Q2) with power. A second power supply unit(V2) supplies a collector of the second transistor(Q2) with power. A bias permitting tap(BI) permits the electrostatic bias into the power amplifier through the first transistor(Q1) and the second transistor(Q2). A third transistor(Q3) amplifies a signal in which the bias is permitted.
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