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Characterization of memory effects in power amplifiers using digital two-tone measurements
KTH, School of Electrical Engineering (EES), Signal Processing.
Racomna AB, Uppsala.
Department of Electronics, University of Gävle.
2007 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, Vol. 56, no 6, 2757-2766 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, a novel method to measure the amplitude and phase of two-tone third-order intermodulation products generated in a high-power amplifier is presented. The method is based on the sampled input and output signals of the amplifier. The presented measurement setup and the associated algorithms for the calculation of the amplitudes and phases are considerably faster and simpler than the current methods. By making use of the sampled input and output signals of the amplifier and the signal processing techniques, the need for a nonlinear reference, a tunable attenuator, and a phase shifter in the existing measurement setups is eliminated, which makes it simple and easy to use. Hence, this is a substantial simplification of the measurement setup compared to what has been reported earlier. The proposed measurement setup is also suitable for fast automated measurements, which is of interest for many applications that are both laboratory and production oriented. In addition, a method to increase the bandwidth of the measured signal is used to overcome the bandwidth limitation set by the Nyquist criteria for sampled systems. Measurements are done on two base-station high-power amplifiers and are found to be in agreement with theory and reference measurements.

Place, publisher, year, edition, pages
2007. Vol. 56, no 6, 2757-2766 p.
Keyword [en]
Amplifier distortion; Amplifiers; Measurement; Microwave; N0onlinear distortion; Power amplifiers; Bandwidth; Computational methods; Intermodulation distortion; Microwaves; Nonlinear distortion; Power amplifiers; Signal processing; High-power amplifier; Nyquist criteria; Intermodulation measurement
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-7757DOI: 10.1109/TIM.2007.907949ISI: 000251745500078Scopus ID: 2-s2.0-37249019108OAI: oai:DiVA.org:kth-7757DiVA: diva2:12879
Note
QC 20100824. Tidigare titel: Characterization of Memory Effects in RF Power Amplifiers Using Digital Two-Tone Measurements. Titel ändrad och uppdaterad från Accepted till Published 20100824.Available from: 2007-12-07 Created: 2007-12-07 Last updated: 2010-08-24Bibliographically approved
In thesis
1. Measurement Techniques for Characterization of Power Amplifiers
Open this publication in new window or tab >>Measurement Techniques for Characterization of Power Amplifiers
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

In this thesis a sampling time domain measurement system primarily intended for measurements on radio frequency power amplifiers is discussed. The need for such a measurement system is established. Impairments due to non-ideal measurement instruments are discussed as well as methods to compensate for these impairments. Techniques to improve upon the raw measurement performance of the measurement instruments with regard to bandwidth, dynamic range, linear and nonlinear distortion are discussed.

| A method to simultaneously find the phase and amplitude ripple of a vector signal generator and a vector signal analyzer is presented. The method is verified with extensive measurements.

Two techniques, frequency stitching and Zhu’s generalized sampling theorem, to extend the effective measurement bandwidth of the measurement system is discussed and evaluated with measurements. They are both found to be able to extend the effective bandwidth for measurements of output signals of nonlinear power amplifiers with more than five times.

The measurement system is used for sampled input – output measurements of power amplifiers and the obtained data are fitted to different behavioral power amplifier models including memory. Some different behavioral models are evaluated and compared for different kinds of power amplifiers. A neural network model and extensions to the well-known parallel Hammerstein model are specifically discussed. The parallel Hammerstein model are also used together with frequency stitching and Zhu’s generalized sampling theorem.

A general hardware and software structure of a versatile measurement system based on virtual instruments for measurements on power amplifiers is discussed in some detail. Special attention is given to the software architecture and to the concepts of hardware and software reusability.

An automated, fast, accurate and production-friendly method for two-tone power and frequency sweep measurements, including measurement of the phase of the intermodulation products in addition to the amplitude, is also presented.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 59 p.
Series
Trita-EE, ISSN 1653-5146 ; 2007:063
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-4566 (URN)978-91-7178-758-3 (ISBN)
Public defence
2007-12-14, Sal 99:133, Högskolan i Gävle, Kungsbäcksvägen 47, Gävle, 13:00
Opponent
Supervisors
Note
QC 20100823Available from: 2007-12-07 Created: 2007-12-07 Last updated: 2010-08-24Bibliographically approved

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