Independent PA biasing of a driver stage and a final stage

摘要

A radio frequency (RF) communications system, which includes power amplifier (PA) control circuitry and PA bias circuitry, is disclosed. The PA control circuitry identifies a selected communications mode of the RF communications system and a target output power from RF PA circuitry. The PA control circuitry selects a PA bias level of a driver stage of the RF PA circuitry and a PA bias level of a final stage of the RF PA circuitry based on the selected communications mode and the target output power. The PA bias circuitry establishes a PA bias level for the driver stage and a PA bias level for the final stage based on the selected PA bias levels of the driver stage and the final stage, respectively.

主权项

1. A radio frequency (RF) communications system comprising:
power amplifier (PA) control circuitry adapted to:
identify a selected communications mode of the RF communications system and a target output power from RF PA circuitry;select a PA bias level of a first driver stage of the RF PA circuitry and a PA bias level of a first final stage of the RF PA circuitry based on the selected communications mode and the target output power; and PA bias circuitry adapted to:
establish the PA bias level of the first driver stage based on the selected PA bias level of the first driver stage by providing a first driver bias signal to the first driver stage via driver stage current digital-to-analog converter (IDAC) circuitry; andestablish the PA bias level of the first final stage based on the selected PA bias level of the first final stage by providing a first final bias signal to the first final stage via final stage IDAC circuitry,wherein the first driver stage and the first final stage are independently biased.