Characterization of memory effects in power amplifiers using digital two-tone measurements
2007 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, Vol. 56, no 6, 2757-2766 p.Article in journal (Refereed) Published
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.
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
IdentifiersURN: urn:nbn:se:kth:diva-7757DOI: 10.1109/TIM.2007.907949ISI: 000251745500078ScopusID: 2-s2.0-37249019108OAI: oai:DiVA.org:kth-7757DiVA: diva2:12879
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 20100824.2007-12-072007-12-072010-08-24Bibliographically approved