Patent ID: 6617927
Filing Date: 2003-09-09
Classification: H01L,H03F,H03G,H04B

Abstract:
A high frequency power amplifier module comprising:an input terminal adapted to be fed with a signal to be amplified; an output terminal; a control terminal for receiving a control voltage; a semiconductor amplification element including: a source; a drain for outputting a signal to said output terminal; and a first gate and a second gate between said drain and said source, said first gate being closer to said drain for receiving a control signal from said control terminal, and said second gate being closer to said source for receiving the signal to be amplified from said input terminal; and a bias circuit which is coupled to the control terminal, to the first gate and to the second gate and which supplies first and second bias voltages according to the control voltage to the first and second gates, respectively, wherein each of the first bias voltage to be supplied to the first gate and the second bias voltage to be supplied to the second gate changes in synchronism with change of the control voltage, and wherein a direction of the potential change in each of the first bias voltage and the second bias voltage is the same as a direction of the potential change in the control voltage.