Paper Info
Title
Iterative Determination Of Phase Reference In Imd Measurement To Characterize Nonlinear Behavior, And To Derive Inverse, For Power Amplifier With Memory Effect
Abstract
To reduce laborious tasks of the phase determination, our previous paper has proposed a method to derive phase reference for two-tone intermodulation distortion (IMD) measurement of a power amplifier (PA) by using small-signal S-parameters. Since the method is applicable to low output power level, this paper proposes an iterative process to extend the applicable power level up to 1-dB compression. The iterative process is based on extraction of linear response: the principle of the extraction is described theoretically by using an accurate model of the PA with memory effect. Measurement of two-tone IMD is made for a GaN FET PA. Validity of the iteration is confirmed as convergence of the extracted linear response to that given by the product of S-21 and input signal. Measured results also show validity of the physical model of the memory effect provided by Vuolevi et al. because beat frequency dependences of IMD's are accurately fitted by bias impedances at even order harmonics of envelope frequency. The PA is characterized by using measured results and the third and fifth order inverses of the PA are designed. Improvement of IMD is theoretically confirmed by using the inverses as predistorters.
Year
DOI
Venue
2011
10.1587/transele.E94.C.1515
IEICE TRANSACTIONS ON ELECTRONICS
Keywords
Field
DocType
power amplifier, IMD measurement, memory effect, bias impedance, predistorter
Convergence (routing),Inverse,Nonlinear system,Iterative and incremental development,Control theory,Electrical impedance,Electronic engineering,Harmonics,Intermodulation,Engineering,Amplifier
Journal
Volume
Issue
ISSN
E94C
10
1745-1353
Citations 
PageRank 
References 
2
0.63
2
Authors
6
Name
Order
Citations
PageRank
Yasuyuki Oishi1338.87
Shigekazu Kimura252.19
Eisuke Fukuda3379.23
Takeshi Takano452.87
Yoshimasa Daido563.92
Kiyomichi Araki628656.35