Extraction of a Multi-Dimensional Polynomial Device Model for an Improved Distortion Contribution Analysis Technique

Author

Aikio, Janne P. ; Rahkonen, Timo ; Pedro, Jose C.

Author_Institution

Dept. of Electr. Eng., Univ. of Oulu, Oulu, Finland

Volume

63

Issue

1

fYear

2015

fDate

Jan. 2015

Firstpage

155

Lastpage

164

Abstract

This paper presents a method to characterize a multi-dimensional polynomial current and charge source models needed for a distortion contribution analysis technique that can identify the dominant nonlinearities and different mixing mechanisms. A separate model characterization step with carefully chosen test signals is used to break the inherent input-output correlation that otherwise complicates the model fitting. The proposed Volterra-on-top-of-harmonic-balance technique and improved polynomial fitting are then verified through the analysis of a 100-W LDMOS RF Doherty amplifier, which showed that, in this circuit, the cubic nonlinearity of the gate capacitance is the main culprit of AM-PM distortion.

Keywords

MIS devices; Volterra equations; harmonic distortion; multidimensional systems; polynomials; radiofrequency power amplifiers; AM-PM distortion; LDMOS RF Doherty amplifier; Volterra-on-top-of-harmonic-balance technique; cubic nonlinearity; distortion contribution analysis technique improvement; gate capacitance; input-output correlation; laterally diffused metal oxide semiconductor; mixing mechanisms; multidimensional polynomial current and charge source models; multidimensional polynomial device model extraction; polynomial fitting improvement; power 100 W; test signals; Analytical models; Correlation; Data models; Harmonic analysis; Integrated circuit modeling; Mathematical model; Polynomials; Distortion analysis; Doherty power amplifier (PA); Volterra 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.2014.2367530

Filename

6963511