| 摘要 |
The present invention is characterized in that a resistor is inserted in series with an inductor feeding a bias current and that reactance of an input matching circuit or of an output matching circuit is varied depending on variations of input signal power. According to the present invention, the input impedance of the amplifying element is restrained from lowering even when the input signal power has increased so that a constantly satisfactory impedance matching is achieved irrespective of the input signal power variations. Furthermore, restriction on increase of the bias current enables a limitation to be imposed on increase of the power consumption of the microwave amplifier.
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