Wideband Characterization of a Doherty Amplifier Using Behavioral Modeling

QC 20100824
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.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Signalbehandling hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Signal Processing hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Annan elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
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
Signal processing
Signalbehandling
Electronics

Isaksson, MagnusHögskolan i Gävle,KTH,Signalbehandling,Ämnesavdelningen för elektronik(Swepub:hig)min (author)
Keskitalo, NiclasHögskolan i Gävle,Ämnesavdelningen för elektronik(Swepub:hig)nko (author)
Rönnow, DanielHögskolan i Gävle,Ämnesavdelningen för elektronik(Swepub:hig)dalrow (author)
KTHSignalbehandling (creator_code:org_t)

By the author/editor: Wisell, David; Isaksson, Magnus; Keskitalo, Nicla ...; Rönnow, Daniel

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Signal Processin ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Other Electrical ...

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