Patent ID: 6774725
Filing Date: 2004-08-10
Classification: H03F,H03G

Abstract:
A power supply system for a high frequency power amplifier, comprising:a voltage converter circuit which switching-controls a current flowing through an inductor to thereby generate a desired voltage; a voltage control transistor which outputs a voltage corresponding to a control voltage in response to a voltage outputted from a power supply; and a power control circuit which controls the voltage control transistor, wherein one or more semiconductor integrated circuits and one or more electronic parts are packaged on one insulated substrate, wherein in a first mode, the voltage converter circuit is brought to a non-operating state upon a high output to turn on the voltage control transistor so as to output the voltage sent from the power supply to a power output terminal, and the voltage converter circuit is operated upon a low output to output a voltage converted by the voltage converter circuit to the power output terminal, and wherein in a second mode, the voltage converter circuit is brought to a non-operating state to control the voltage control transistor based on a first signal for designating an output level, thereby outputting a voltage corresponding to the first signal to the power output terminal.