Title :
A novel DSP architecture of adaptive feedforward linearizer for RF amplifiers
Author :
Yuanxun Wang ; Fredrick, J.D. ; Itoh, T.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
A novel adaptive design for feedforward amplifier linearizer with DSP control is proposed in this paper. Compared to existing adaptive architectures, this is a "blind" design which does not require pilot signal and intentional signal perturbation and phase calibration. A polar gradient adaptive algorithm is developed to support the hardware architecture, providing the unconditional convergence during the full working range of the phase control components. The stability criterion is analyzed. The linearizer performance for multi-tones and for a CDMA signal is simulated and demonstrated using EDA design tools.
Keywords :
UHF amplifiers; adaptive signal processing; circuit stability; feedforward; linearisation techniques; radiofrequency amplifiers; stability criteria; CDMA signal; DSP architecture; DSP control; EDA design tools; RF amplifiers; adaptive feedforward linearizer; convergence; multi-tones; phase control components; polar gradient adaptive algorithm; stability criterion; Adaptive algorithm; Adaptive control; Calibration; Convergence; Digital signal processing; Hardware; Programmable control; Radio frequency; Radiofrequency amplifiers; Signal design;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.967014
