Title :
Transmitter linearization using Cartesian feedback for linear TDMA modulation
Author :
Johansson, Mats ; Mattsson, Thomas
Author_Institution :
Dept. of Appl. Electron., Lund Univ., Sweden
Abstract :
A linearized power amplifier suitable for low-power portable radio applications is described. One narrow-bandwidth and one wide-bandwidth application are investigated. Up to 40% power-added efficiency can be achieved for a 20-dB reduction of the third-order intermodulation products at 1.5 MHz from the carrier frequency in the wide-bandwidth system. Less than -60 dB out-of-band emission and 38% power-added efficiency can be obtained for a narrow-bandwidth system
Keywords :
feedback; linearisation techniques; mobile radio systems; power amplifiers; radio transmitters; radiofrequency amplifiers; time division multiple access; 38 percent; 40 percent; Cartesian feedback transmitter; carrier frequency; linear TDMA modulation; linearized power amplifier; low-power portable radio applications; narrow-bandwidth system; out-of-band emission; power-added efficiency; third-order intermodulation products; wide-bandwidth system; Amplitude modulation; Bandwidth; Cutoff frequency; Feedback; Personal communication networks; Phase modulation; Power amplifiers; Radio transmitters; Radiofrequency amplifiers; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-87942-582-2
DOI :
10.1109/VETEC.1991.140527
