CONTROL CIRCUIT OF POWER AMPLIFIER

To provide a power amplifier capable of suitably controlling in both of a first operation mode for variably controlling a bias current according to an amplification output level control voltage and a second operation mode for not variably controlling the bias current according to the level control voltage.SOLUTION: A control circuit 100 includes a first output portion 111 that outputs a constant bias current Ifor setting an electrical bias state of a bias circuit 142, a second output portion 112 that outputs a bias control current Ifor controlling the electrical bias state of the bias circuit or a constant voltage, a resistor 102 having one end connected to a reference potential, and a switch provided between another end of the resistor and an output terminal of the second output portion.SELECTED DRAWING: Figure 3 【課題】増幅出力レベル制御電圧に応じてバイアス電流を可変制御する第１の動作モードと、レベル制御電圧に応じてバイアス電流を可変制御しない第２の動作モードの両方で好適に制御できる電力増幅器を提供する。【解決手段】制御回路１００は、バイアス回路１４２の電気的バイアス状態を設定する一定のバイアス電流Ｉｂｉａｓをバイアス回路に出力する第１出力部１１１と、バイアス回路の電気的バイアス状態を制御するバイアス制御電流Ｉｅｃ又は定電圧をバイアス回路に出力する第２出力部１１２と、一端が基準電位に接続された抵抗１０２と、抵抗の他端と第２出力部の出力端子の間に設けられたスイッチを備える。【選択図】図３