An Adaptive Control Method for Microwave Linear Power Amplifier

Author

Zhu, Wang ; Kaiyu, Qin ; Kai, Yang ; Man, Zhu ; Changwei, Chen ; Xilin, Zhang

Author_Institution

Sch. of Autom. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu

Volume

4

fYear

2006

fDate

25-28 June 2006

Firstpage

2573

Lastpage

2576

Abstract

Feedforward linearization has advantages in wide bandwidth over other linearization methods. However, the amplitude and the phase of feedforward system will shift when the work condition and environment change. A novel digital control method based on DSP+FPGA is proposed in this paper, with an improved LMS algorithm, which controls adaptively the attenuators and phase shifters of feedforward power amplifier. Compared to existing feedforward architectures, this system without pilot signal has higher speed and better flexibility. The test results show that the IMD3 is suppressed for more than 30 dB, with very fast convergence in LMS.

Keywords

adaptive control; digital control; digital signal processing chips; feedforward; field programmable gate arrays; least mean squares methods; linearisation techniques; microwave power amplifiers; DSP; FPGA; IMD3; LMS algorithm; adaptive control method; attenuators; digital control method; feedforward power amplifier; microwave linear power amplifier; phase shifters; Adaptive control; Attenuators; Bandwidth; Digital control; Feedforward systems; Least squares approximation; Microwave amplifiers; Microwave theory and techniques; Phase shifters; Power amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems Proceedings, 2006 International Conference on

Conference_Location

Guilin

Print_ISBN

0-7803-9584-0

Electronic_ISBN

0-7803-9585-9

Type

conf

DOI

10.1109/ICCCAS.2006.285199

Filename

4064446