Title :
Linearization of RF power amplifiers using power feedback
Author :
Shi, Bo ; Sundström, Lars
Author_Institution :
Dept. of Appl. Electron., Lund Univ., Sweden
Abstract :
This paper describes a simple and partly new method for linearization of RF power amplifiers using power feedback. Both analysis and experimental results are given. In the analysis, the fundamental properties associated with this scheme are investigated. Advantages and disadvantages are identified and compared with similar linearization techniques. For a given power amplifier characteristics, a simulation method is described to obtain the theoretical limit of reducing nonlinearities with this scheme. Experimental results are also obtained from a prototype linearization system built around a full custom RF analog integrated circuit in CMOS technology that implements the power feedback scheme. When it was tested with an commercially available efficient power amplifier transmitting a NADC (North American Digital Cellular) signal, a reduction of about 10 dB in the adjacent channel interference was achieved. This is in close agreement with the simulation result
Keywords :
CMOS analogue integrated circuits; UHF integrated circuits; UHF power amplifiers; adjacent channel interference; cellular radio; circuit simulation; feedback amplifiers; interference suppression; linearisation techniques; radio equipment; 10 dB; CMOS; NADC; North American Digital Cellular; RF power amplifiers; adjacent channel interference; custom RF analog integrated circuit; linearization; nonlinearities; power feedback; simulation method; Analog integrated circuits; CMOS technology; Circuit simulation; Feedback; Linearization techniques; Power amplifiers; Prototypes; Radio frequency; Radiofrequency amplifiers; Radiofrequency identification;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.780601
