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Implementation Considerations on the Use of Zhu's General Sampling Theorem for Characterization of Power Amplifiers
KTH, School of Electrical Engineering (EES), Signal Processing.
KTH, School of Electrical Engineering (EES), Signal Processing.ORCID iD: 0000-0002-2718-0262
2007 (English)In: Conference Record - IEEE Instrumentation and Measurement Technology Conference, 2007, 612-615 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper Zhu's generalized sampling theorem for sampling of the output signal of a nonlinear system is applied to the case of radio frequency power amplifier modeling. The paper deals in some detail with hardware implementational issues in order to optimize the hardware design in order to make full use of the benefits given by Zhu's generalized sampling theorem. It is shown that some design changes have to be done compared to more traditional receiver designs, such as removing the anti-aliasing filters. It is also shown that the behavioral ampler models that are extracted using data taken using Zhu's generalized sampling theorem have equal or better performance with regard to out-of-band spectral emissions than when the models are extracted using data taken using Nyquist sampling of the output signal of the amplifier.

Place, publisher, year, edition, pages
2007. 612-615 p.
Series
IEEE Instrumentation and Measurement Technology Conference, ISSN 1091-5281
Keyword [en]
Generalized sampling theorem; Power amplifier modeling; Computer hardware; Data reduction; Sampling; Spectrum analysis; Theorem proving; Wave filters; Output signals; Radio frequency power
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-7754ISI: 000251296800122Scopus ID: 2-s2.0-34648833239ISBN: 978-1-4244-0588-6 (print)OAI: oai:DiVA.org:kth-7754DiVA: diva2:12876
Conference
2007 IEEE Instrumentation and Measurement Technology, IMTC 2007 - Synergy of Science and Technology in Instrumentation and Measurement; Warsaw; 1 May 2007 through 3 May 2007
Note
QC 20100824Available 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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Händel, Peter

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