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A two-tone test for characterizing nonlinear dynamic effects of radio frequency amplifiers in different amplitude regions
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences. Department of Signal Processing, ACCESS Linnaeus Center, The Royal Institute of Technology (KTH), Stockholm, Sweden.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.ORCID iD: 0000-0003-2887-049X
2016 (English)In: Measurement, ISSN 0263-2241, E-ISSN 1873-412X, Vol. 89, 273-279 p.Article in journal (Refereed) Published
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Text
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
2016. Vol. 89, 273-279 p.
Keyword [en]
Two-tone test, Intermodulation, Nonlinear, Radio frequency amplifier, Volterra series
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:hig:diva-21566DOI: 10.1016/j.measurement.2016.04.027ISI: 000376463700032Scopus ID: 2-s2.0-84982297904OAI: oai:DiVA.org:hig-21566DiVA: diva2:935105
Available from: 2016-06-10 Created: 2016-06-10 Last updated: 2017-11-30Bibliographically approved

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