A High Efficiency WCDMA RF Power Amplifier With Adaptive, Dual-Mode Buck-Boost Supply and Bias-Current Control

Radio-frequency (RF) power amplifiers (PAs) are often the most power-consuming blocks in portable wireless systems, and maintaining high PA efficiency at heavy and light loads is therefore critical for extended battery life. This letter presents how a 0.5-mum CMOS dynamically adaptive, dual-mode buc...

Full description

Saved in:
Bibliographic Details
Published in:IEEE microwave and wireless components letters 2007-03, Vol.17 (3), p.238-240
Main Authors: Sahu, B., Rincon-Mora, G.A.
Format: Article
Language:English
Subjects:
Adaptive bias
Adaptive control
Adaptive control systems
adaptive supply
Amplifiers
Applied sciences
Batteries
Battery
battery life
Circuit properties
Circuits
Code Division Multiple Access
Design. Technologies. Operation analysis. Testing
dynamic bias
dynamic supply
Dynamical systems
Dynamics
Efficiency
Electric potential
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Heterojunction bipolar transistors
High power amplifiers
Integrated circuits
Multiaccess communication
power amplifier (PA)
Power amplifiers
Power supplies
Programmable control
Radio frequencies
Radio frequency
Radiofrequency amplifiers
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Silicon germanides
stand-by performance
Studies
wideband code-division-multiple-access (WCDMA)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Radio-frequency (RF) power amplifiers (PAs) are often the most power-consuming blocks in portable wireless systems, and maintaining high PA efficiency at heavy and light loads is therefore critical for extended battery life. This letter presents how a 0.5-mum CMOS dynamically adaptive, dual-mode buck-boost power supply and bias-current control circuit improves PA efficiency. The proposed system is validated with a 1.96-GHz, 25-dBm SiGe heterojunction bipolar transistor (HBT) wideband code division multiple access RF PA, where its supply voltage and bias current are dynamically adjusted from 0.4 to 4.5 V and 25 to 220mA, respectively, over an output power range of -50 to 25dBm. The prototype system is functional for a 1.8-4.2V input supply range, meeting adjacent- and alternate-channel leakage ratio specifications with less than 10% of error vector magnitude across the entire power range. The average efficiency of the dynamically adaptive system (13.67%) was 7times better than the corresponding fixed-supplied, fixed-biased scheme (1.95%), with the same HBT PA
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2006.890505