Patent ID: 7227415
Filing Date: 2007-06-05
Classification: H03F,H03G

Abstract:
1. A power amplifier module for wireless communication, comprising: an amplifying means for generating a radio frequency signal to be transmitted and which includes amplifying stages cascaded in series; a bias means for supplying bias voltages set to predetermined values to each of the amplifying stages; and a power source control means for generating a first voltage for a final one of the amplifying stages which outputs the radio frequency signal and for generating a second voltage for preceding ones of the amplifying stages which receives a signal to be amplified by the amplifying means; and a insulating substrate for mounting the amplifying means, bias means and power source control means, wherein the power source control means includes a first control means for controlling the first voltage and a second control means which is different from the first control means for controlling the second voltage, and wherein the power source control means sets the second voltage to determine a current flow on the preceding ones of the amplifying stages in a saturated state, when the first voltage is set to determine a current flow on the final one of the amplifying stages in a linear state.