DocumentCode
1062257
Title
A Comprehensive Analysis of AM–AM and AM–PM Conversion in an LDMOS RF Power Amplifier
Author
Aikio, Janne P. ; Rahkonen, Timo
Author_Institution
Dept. of Electr. & Inf. Eng. & Infotech Oulu, Univ. of Oulu, Oulu
Volume
57
Issue
2
fYear
2009
Firstpage
262
Lastpage
270
Abstract
In this paper, a Volterra analysis built on top of a normal harmonic balance simulation is used for a comprehensive analysis of the causes of AM-PM distortion in a LDMOS RF power amplifier (PA). The analysis shows that any nonlinear capacitors cause AM-PM. In addition, varying terminal impedances may pull the matching impedances and cause phase shift. The AM-PM is also affected by the distortion that is mixed down from the second harmonic. As a sample circuit, an internally matched 30-W LDMOS RF PA is used and the results are compared to measured AM-AM, AM-PM and large-signal S11.
Keywords
Volterra equations; power amplifiers; AM-AM conversion; AM-PM conversion; AM-PM distortion; LDMOS RF power amplifier; Volterra analysis; matching impedances; nonlinear capacitors; normal harmonic balance simulation; phase shift; terminal impedances; AM–AM; AM–PM; RF power amplifier (PA); Volterra analysis; distortion analysis; polynomial device model;
fLanguage
English
Journal_Title
Microwave Theory and Techniques, IEEE Transactions on
Publisher
ieee
ISSN
0018-9480
Type
jour
DOI
10.1109/TMTT.2008.2011161
Filename
4745829
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