Wideband Characterization of a Doherty Amplifier Using Behavioral Modeling
2007 (English)In: 2006 67th ARFTG Microwave Measurements Conference: Measurements and Design of High Power Devices and Systems, 2007Conference paper (Refereed)
A Doherty amplifier was investigated using behavioral amplifier modeling techniques. A measurement system for simultaneous wide bandwidth (>100 MHz) and large dynamic range (similar to 70 dBc ACLR) sampled measurements that are needed for the behavioral modeling is presented. Both the measurement system and the performance of the Doherty amplifier are described. The findings are that the well known and widely used parallel Hammerstein model, also denoted the memory polynomial model, is well suitable also for modeling and predistortion of Doherty amplifiers, and that a Doherty amplifier can be designed with only minor memory effects. This is seen in the modeling error, which is reduced by 13 dB, compared with a constant gain, using a memoryless polynomial model and only 6 dB further by adding memory to the model.
Place, publisher, year, edition, pages
Broadband amplifiers; DC generators; Electric equipment; Mathematical models; Microwave measurement; Microwaves; Optical beam splitters; Behavioral modeling; Constant gains; Doherty amplifiers; Dynamic ranges; Measurement systems; Memory effects; Memory polynomials; Modeling errors; Modeling techniques; Parallel hammerstein models; Polynomial models; Pre distortions; Wide bands; Wide bandwidths; Measurements
IdentifiersURN: urn:nbn:se:kth:diva-7761DOI: 10.1109/ARFTG.2006.4734374ISI: 000261875200022ScopusID: 2-s2.0-60649113087ISBN: 978-0-7803-9529-9OAI: oai:DiVA.org:kth-7761DiVA: diva2:12883
2006 67th ARFTG Microwave Measurements Conference - Measurements and Design of High Power Devices and Systems; San Francisco, CA; 16 June 2006
QC 201008242007-12-072007-12-072010-08-24Bibliographically approved