NDLI: Extraction of accurate behavioral models for power amplifiers with memory effects using two-tone measurements

Content Provider	IEEE Xplore Digital Library
Author	Hyunchul Ku Mckinley, M.D. Kenney, J.S.
Copyright Year	2002
Description	Author affiliation: Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA (Hyunchul Ku; Mckinley, M.D.; Kenney, J.S.)
Abstract	This paper proposes a system-level behavioral model for RF power amplifiers (PAs) that exhibit memory effects. PAs with memory effects are shown to have two-tone intermodulation distortion (IMD) levels that vary depending on tone-spacing. Thus, typical single tone extracted AM/AM and AM/PM characteristics cannot accurately model PA memory effects. By varying the frequency spacing of two-tone signals, envelope frequency dependent transfer functions can be derived. Using these transfer functions, a behavioral model is developed which is based on the parallel-cascade linear and nonlinear (LN) system. This model gives more accurate results in predicting the behavior of PAs with memory effects close to the carrier frequency. The model is validated by comparing the predicted and measured adjacent channel power ratio (ACPR) of a CDMA signal amplified by a high power class-AB PA. It is found that the parallel cascade model improves ACPR prediction accuracy by as much as 4 dB compared to the single tone derived memoryless model.
Starting Page	139
Ending Page	142
File Size	488246
Page Count	4
File Format	PDF
ISBN	0780372395
ISSN	0149645X
DOI	10.1109/MWSYM.2002.1011578
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-06-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power amplifiers Power system modeling Predictive models Radiofrequency amplifiers Transfer functions Radio frequency Intermodulation distortion Frequency dependence Power measurement Multiaccess communication
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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