Independent PA biasing of a driver stage and a final stage

US8811921B2 · kind B2 · utility

Assignee

• RF Micro Devices, Inc. · US

Inventors

• David E. Jones · Layton, US
• William David Southcombe · San Diego, US
• Brian Baxter · Greensboro, US
• Roman Zbigniew Arkiszewski · Oak Ridge, US
• Chris Levesque · Willow View Lane, US
• Scott Yoder · Fuquay-Varina, US
• Terry J. Stockert · Cedar Rapids, US

Key dates

• Filing date: Nov 28, 2011
• Grant date: Aug 19, 2014
• Expiry date: Nov 28, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03F2203/21157
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

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.