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A Distortion Analysis Method for FET Amplifiers Using Novel FrequencyDependent Complex Power Series Model
Kenichi HORIGUCHI Kazuhisa YAMAUCHI Kazutomi MORI Masatoshi NAKAYAMA Yukio IKEDA Tadashi TAKAGI
Publication
IEICE TRANSACTIONS on Electronics
Vol.E82C
No.5
pp.737743 Publication Date: 1999/05/25 Online ISSN:
DOI: Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Issue on Low Distortion Technology for Microwave Devices and Circuits) Category: Keyword: distortion, analysis, FET amplifiers, frequency characteristics, complex power series, nonlinear,
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Summary:
This paper proposes a new distortion analysis method for frequencydependent FET amplifiers, which uses a novel FrequencyDependent Complex Power Series (FDCPS) model. This model consists of a frequencyindependent nonlinear amplifier represented by an oddorder complex power series and frequencydependent input and output filters. The inband frequency characteristics of the saturation region are represented by the frequencydependent output filter, while the inband frequency characteristics of the linear region are represented by the frequencydependent input and output filters. In this method, the timedomain analysis is carried out to calculate the frequencyindependent nonlinear amplifier characteristics, and the frequencydomain analysis is applied to calculate the frequencydependent input and output filter characteristics. The thirdorder intermodulation (IM3) calculated by this method for a GaAs MESFET amplifier is in good agreement with the numerical results obtained by the Harmonic Balance (HB) method. Moreover, the IM3 calculated by this method also agrees well with the measured data for an Lband 3stage GaAs MESFET amplifier. It is shown that this method is effective for calculating frequencydependent distortion of a nonlinear amplifier with broadband modulation signals.


