Craig Andrews

US Patent:

7167054, Jan 23, 2007

Filed:

Dec 2, 2004

Appl. No.:

11/002473

Inventors:

David Dening - Stokesdale NC, US
Craig Andrews - Austin TX, US
Michael R. Kay - Summerfield NC, US
Jackie Johnson - Trinity NC, US
Ulrik Riis Madsen - Herning, DK

Assignee:

RF Micro Devices, Inc. - Greensboro NC

International Classification:

H03F 3/04

US Classification:

330297, 330296

Abstract:

Power control circuitry that is configurable as either a Low Dropout (LDO) voltage regulator or a switching DC—DC converter for controlling a variable supply voltage provided to a power amplifier of a mobile terminal is provided. The power control circuitry includes an output stage including first and second output transistors, an analog control system, and a digital control system. When in LDO voltage regulator mode, the analog control system provides an analog control signal to the first transistor based on an adjustable power control signal and a feedback signal indicative of the variable supply voltage, and the digital control system operates to disable the second output transistor. When in DC—DC converter mode, an output stage of the analog control system is disabled, and the digital control system provides binary control signals to the first and second transistors based on the adjustable power control signal and the feedback signal.