DocumentCode
3090028
Title
High efficiency envelope tracking supply voltage modulator for high power base station amplifier applications
Author
Aitto-oja, T.M.
Author_Institution
Nokia Siemens Networks, Oulu, Finland
fYear
2010
fDate
23-28 May 2010
Firstpage
1
Lastpage
1
Abstract
Wideband supply voltage modulator with efficiency of 85.1% with 7.5dB PAPR (Peak to average power ratio) (WCDMA, LTE, MC-GSM signals), 120W average output power and 91.7% with 0dB PAPR (GSM applications), 130W output power signals was built. Supply voltage modulator consists of parallel linear amplifier and switching stage. Linear amplifier is controlled by envelope signal, and novel method for controlling switching stage is presented, resulting in high efficiency and low sensitivity to component variations. New control achieved over 20%-unit efficiency improvement in back-off, and measured efficiency was above 80% over 14dB average power range with 7.5dB PAPR test signal. Modulator achieved 20MHz operation fulfilling linearity requirements.
Keywords
Base stations; Broadband amplifiers; GSM; High power amplifiers; Multiaccess communication; Peak to average power ratio; Power amplifiers; Power generation; Voltage; Wideband;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location
Anaheim, CA
ISSN
0149-645X
Print_ISBN
978-1-4244-6056-4
Electronic_ISBN
0149-645X
Type
conf
DOI
10.1109/MWSYM.2010.5514956
Filename
5514956
Link To Document