Patent ID: 6701138
Filing Date: 2004-03-02
Classification: H03F,H03G

Abstract:
A power amplifier configuration comprising:a) power control circuitry comprising: i) a power regulator providing an output voltage at an output node responsive to an adjustable power control signal; ii) an error amplifier having a first input for receiving the adjustable power control signal, a second input, and an output coupled to the power regulator to control the output voltage at the output node; and iii) a feedback network coupled between the output node of the power regulator and the second input of the error amplifier; and b) power amplifier circuitry including an input amplifier stage in series with an output amplifier stage for amplifying a radio frequency input signal, the input amplifier stage receiving power from a fixed voltage node and the output amplifier stage receiving power via the output node of the power regulator; wherein the adjustable power control signal is adjusted to control output power provided by the power amplifier circuitry by controlling the voltage supplied to the output amplifier stage and the output of the error amplifier is responsive to both the adjustable power control signal and a voltage signal fed back from the output node of the power regulator.