Patent ID: 9461599
Filing Date: 2016-10-04
CPC Classification: H03F

Claim Text:
1. A circuit comprising: a power amplifier comprising one or more power stage transistors; a memory that stores bias current values corresponding to a plurality of frequencies across a frequency band for setting bias of the one or more power stage transistors of the power amplifier based on selected frequencies; a controller configured to provide at least one bias current value corresponding to a selected frequency from the memory to the power amplifier in response to a frequency selection signal, wherein a first terminal of a first power stage transistor of the one or more power stage transistors is configured to receive a radio frequency input signal and a second terminal of the first power stage transistor is configured to receive a power supply voltage that changes based on the radio frequency input signal; and a feedback system for biasing the power amplifier during operation, wherein the feedback system is operable to evaluate an output signal of the power amplifier and to select a bias current value for the frequency of the output signal based on a performance metric of the power amplifier.