A Two-Port Nonlinear Dynamic Behavioral Model of RF PAs Subject to Wideband Load Modulation
G.P. Gibiino , Konstanty Łukasik , Paweł Barmuta , Alberto Santarelli , Dominique M. M.-P. Schreurs , Fabio Filicori
AbstractThis work presents a full two-port, i.e., double input-double output, behavioral modeling approach suitable for radio frequency power amplifiers (PAs) in the presence of dynamic load modulation (DLM). The formulation of the model, based on a first-order approximation of a modified Volterra series, accounts for the nonlinear distortion determined by large-signal operation under mismatched conditions, and also for the memory effects stimulated by a modulated PA input signal, or by the dynamic variations of the PA load. By following an exhaustive procedure defined in the frequency domain, the model of a general purpose commercial PA is extracted over 160 MHz of modulation bandwidth (BW) with nonlinear vector network analyzer measurements. Validation results under 20-MHz BW multisine excitation and injected 80-MHz BW multisine load modulation show improved prediction capabilities with respect to quasi-static or single-input descriptions, allowing for reliable system-level simulations in the presence of DLM.
|Journal series||IEEE Transactions on Microwave Theory and Techniques, ISSN 0018-9480, (A 35 pkt)|
|Publication size in sheets||0.65|
|Keywords in English||Behavioral modeling, large-signal measurements, load modulation, memory effects, power amplifiers (PAs)|
|Publication indicators||: 2016 = 2.897 (2) - 2016=3.26 (5)|
|Citation count*||1 (2018-11-12)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.