Patent ID: 8289084

Claim:
An RF power amplifier device comprising: a driver stage amplifier; a first RF amplifier; a second RF amplifier; and a DC voltage converter, wherein the driver stage amplifier, the first RF amplifier, the second RF amplifier, and the DC voltage converter are operable by external power supply voltages supplied from the outside of the RF power amplifier device, wherein an output signal generated from an output terminal of the driver stage amplifier is capable of being supplied to an input terminal of the first RF amplifier and an input terminal of the second RF amplifier, wherein an effective device size of the first RF amplifier is set to a device size larger than an effective device size of the second RF amplifier, wherein the DC voltage converter is capable of generating an operating power supply voltage being a voltage lower than the external power supply voltage by being supplied with the external power supply voltage and supplying the operating power supply voltage to an output terminal of the second RF amplifier, and wherein the external power supply voltage supplied from the outside of the RF power amplifier device is capable of being supplied to an output terminal of the first RF amplifier without via the DC voltage converter.