NDLI: The importance of sub-harmonic frequency terminations in modeling spectral regrowth from CW am-am and am-pm derived non-linearities

Content Provider	IEEE Xplore Digital Library
Author	Staudinger, J.
Copyright Year	1997
Description	Author affiliation: Semicond. Products Sector, Motorola Inc., Tempe, AZ, USA (Staudinger, J.)
Abstract	This paper examines several issues in applying the quadrature modeling technique to predict gain, efficiency, and distortion characteristics of GaAs MESFET rf power amplifiers. This technique relies on representing the power amplifier as a bandpass nonlinearity described by a series expansion of in-phase and quadrature-phase gain transfer functions. It is shown that the order of the series expansion, as well as the selected series basis functions, have a direct influence on model accuracy. Additionally, this method is extended to predict amplifier drain current and efficiency when driven by time varying non-constant (envelope) amplitude signals, e.g., two tone sinusoids and digitally modulated signals. The effects of sub-harmonic frequency terminations occurring near the zeroth spectral zone, such as those due to bias decoupling on the device's drain terminal, are also examined. Generally, they are not considered in deriving the nonlinear transfer functions, and under certain circumstances, exhibit deleterious effects not predicted by this analysis technique.
Starting Page	121
Ending Page	125
File Size	425515
Page Count	5
File Format	PDF
ISBN	0780341945
DOI	10.1109/WCC.1997.622261
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-08-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Power amplifiers Radiofrequency amplifiers Transfer functions Predictive models Nonlinear distortion Gallium arsenide MESFETs Amplitude modulation Digital modulation
Content Type	Text
Resource Type	Article

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