Title :
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
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;
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
DOI :
10.1109/ICCCAS.2006.285199
