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A two-tone test for characterizing nonlinear dynamic effects of radio frequency amplifiers in different amplitude regions
KTH, School of Electrical Engineering (EES), Signal Processing.
(Department of Electronics, Mathematics and Natural Sciences, University of Gävle)
2016 (English)In: Measurement, ISSN 0263-2241, Vol. 89, 273-279 p.Article in journal (Refereed) Published
Abstract [en]

 A new two-tone test method for radio frequency power amplifiers is presented. The test signal is a two-tone probing-signal superimposed on large-signals of different amplitude. The amplifier is, thus, excited in different amplitude regions. The amplitude and phase of the 3rd order intermodulation (IM) products are measured vs. frequency spacing and probing-signal amplitude in each region. The IM magnitude is a measure of the nonlinearity, while the frequency dependence and asymmetry are measures of the memory effects in the different regions. A Doherty and a class-AB amplifier were tested. For both amplifiers the IM magnitude increased by ~15 dB from the lowest to the highest amplitude region. For the Doherty amplifier the behavior of the IM products vs. frequency spacing was similar in all regions, indicating similar memory effects. For the class-AB amplifier the IM vs. frequency spacing was significantly different in the different regions, which indicates different memory effects.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 89, 273-279 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-185792DOI: 10.1016/j.measurement.2016.04.027OAI: diva2:923891

QC 20160607

Available from: 2016-04-27 Created: 2016-04-27 Last updated: 2016-06-07Bibliographically approved

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