Patent ID: 8098102
Filing Date: 2012-01-17
Classification: H03F,H03G

Abstract:
1. An RF power amplifier circuit comprising: a previous-stage amplifier; a next-stage amplifier; and a controller, wherein the previous-stage amplifier responds to an RF transmission input signal accepted through an input terminal, wherein the next-stage amplifier responds to an amplification signal arising from an output terminal of the previous-stage amplifier and accepted through an input terminal, wherein the controller controls quiescent currents of the previous-stage amplifier and next-stage amplifier in response to a power control voltage supplied to a control input terminal, thereby to control gains of the previous-stage amplifier and next-stage amplifier, wherein, in response to the power control voltage, the quiescent current and gain of the previous-stage amplifier are continuously changed according to a first continuous function, and the quiescent current and gain of the next-stage amplifier are continuously changed according to a second continuous function, and wherein the second continuous function is a polynomial function which is at least one degree higher than the first continuous function.