Title :
A wide dynamic range analog predistortion-type linearizer using self-cancellation scheme
Author :
Kim, Ki Hyuk ; Kim, Gyoung Bum ; Hwang, Sung Woo ; Lee, Seung Hee ; Ahn, Doyeol
Author_Institution :
Dept. of Electron. & Comput. Eng., Korea Univ., Seoul, South Korea
Abstract :
A new radio frequency linearized power amplifier (LPA) system for wideband-code-division-multiple-access (WCDMA) application is demonstrated. The main amplifier is a parallel combination of drive amplifiers, and the same type of drive amplifier is also used to generate the predistortion signal. Self-cancellation of the intermodulation-distortion (IMD) components is obtained by the generic identity between the nonlinear characteristics of the main amplifier and the predistortion signal, both of which are originated from the same type of devices. Such self-cancellation scheme exhibits the improvement of 13 dB in the adjacent channel leakage ratio (ACLR) for WCDMA signal excitation.
Keywords :
analogue circuits; code division multiple access; interference suppression; intermodulation distortion; power amplifiers; radiofrequency amplifiers; WCDMA application; WCDMA signal excitation; adjacent channel leakage ratio; drive amplifiers; intermodulation distortion components; predistortion signal; radio frequency linearized power amplifier; self-cancellation scheme; wide dynamic range analog predistortion-type linearizer; wideband-code-division-multiple-access; Broadband amplifiers; Dynamic range; Linearity; Multiaccess communication; Power amplifiers; Power transistors; Predistortion; Radio frequency; Radiofrequency amplifiers; Signal generators; Intermodulation-distortion (IMD) products; linearization; linearized-power-amplifier (LPA); power-amplifier (PA); predistortion;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.856681
