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Exploring the sampling rate requirements for behavioural amplifier modelling
KTH, School of Electrical Engineering (EES), Signal Processing. Ericsson AB, Gävle, Sweden .
2006 (English)In: 18th IMEKO World Congress 2006: Metrology for a Sustainable Development, 2006Conference paper, Published paper (Refereed)
Abstract [en]

In this paper it is shown that for the purpose ofnonlinear power amplifier behavioural modelling, thesampling rate can be set to the Nyquist rate of the inputsignal, rather than to the Nyquist rate of the output signal bymaking use of Zhu’s generalized sampling theorem. Thisclaim is supported by measurements on a basestation poweramplifier. The findings are that the model error obtainedwhen the output signal is sampled at the Nyquist rate of theinput signal is approximately 1.5 dB higher than when thesampling rate is set to the Nyquist rate of the output signal.However, if a sampling rate of twice the Nyquist rate of theinput signal is used, which is still typically, much lower thanthe Nyquist rate of the output signal, the degradation is only0.2 dB. These are important findings that will substantiallyease the requirements on ADCs used in measurement setupsused for amplifier modelling.

Place, publisher, year, edition, pages
2006.
Keyword [en]
Amplifier Modelling, Generalized Sampling Theorem, Undersampling
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-7762Scopus ID: 2-s2.0-84877731295ISBN: 978-162276646-8 (print)OAI: oai:DiVA.org:kth-7762DiVA: diva2:12884
Conference
18th IMEKO World Congress 2006: Metrology for a Sustainable Development; Rio de Janeiro; Brazil
Note

QC 20100824. Tidigare titel: Exploring the Sample Rate Limitation for Modeling of Power Amplifiers. Titel ändrad 20100824.

Available from: 2007-12-07 Created: 2007-12-07 Last updated: 2014-11-05Bibliographically 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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