DocumentCode
27880
Title
High bandwidth class B totem pole power amplifier for envelope modulators
Author
Watkins, Gavin T.
Author_Institution
Toshiba Res. Eur. Ltd., Bristol, UK
Volume
49
Issue
2
fYear
2013
fDate
January 17 2013
Firstpage
127
Lastpage
129
Abstract
A class B totem pole power amplifier is presented. The amplifier has a small signal bandwidth of 23MHz and is capable of driving a 1MHz sinsuiodal signal into a 7.5Ω load resistance at an output power of 3.7W. When amplifying the AC envelope component of a 20MHz bandwidth 3GPP Long Term Evolution (LTE) signal, 2W is produced into the 7.5Ω load. By optimising the supply rails based on the characteristics of the envelope signal, an efficiency of 31Ω is achieved. When combined with a switched mode power supply, it forms an envelope modulator that can achieve 61.6Ω efficiency at 9.3W output power with an output peak-to-average power ratio of 8.5dB.
Keywords
Long Term Evolution; modulators; power amplifiers; 3GPP Long Term Evolution; LTE; bandwidth 20 MHz; bandwidth 23 MHz; class B totem pole power amplifier; efficiency 31 percent; efficiency 61.6 percent; envelope modulators; frequency 1 MHz; power 2 W; power 9.3 W; resistance 7.5 ohm; supply rail signal envelope;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el.2012.3994
Filename
6420092
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