Combined memory polynomial model for Doherty power amplifiers with memory effects

Author

Zhai, Jianfeng ; Zhang, Lei ; Xia, Jing ; Zhou, Jianyi ; Zhu, Xiaowei ; Hong, Wei

Author_Institution

Dept. of Radio Eng., Southeast Univ., Nanjing, China

Volume

2

fYear

2012

fDate

5-8 May 2012

Firstpage

1

Lastpage

3

Abstract

This paper presents a combined memory polynomial model for Doherty power amplifiers with memory effects. The model combines the memory polynomial model with an envelope memory term. Levenberg-Marquardt Method is applied to estimate the model parameters. The model has been successfully validated with 20MHz LTE signals in the test bench, in which the input and output signals of a Doherty power amplifier are sampled by a vector signal analyzer (VSA). Good modeling accuracy can be achieved with normalized mean square errors (NMSE) of about -40 dB by comparison between measurements and modeling results in frequency domain.

Keywords

Long Term Evolution; integrated circuit modelling; mean square error methods; polynomials; power amplifiers; Doherty power amplifiers; LTE; Levenberg-Marquardt method; envelope memory term; frequency 20 MHz; mean square errors; memory effects; memory polynomial model; vector signal analyzer; Accuracy; Measurement uncertainty; Numerical models; Polynomials; Power amplifiers; Training; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on

Conference_Location

Shenzhen

Print_ISBN

978-1-4673-2184-6

Type

conf

DOI

10.1109/ICMMT.2012.6230053

Filename

6230053