Title :
A CMOS dB-linear VGA with pre-distortion compensation for wireless communication applications
Author :
Zheng, Yuanjin ; Yan, Jiangnan ; Xu, Yong Ping
Author_Institution :
ICS Lab., Inst. of Microelectron., Singapore, Singapore
Abstract :
This paper describes a CMOS dB-linear variable gain amplifier (VGA) that can provide a variable gain of 60dB while maintaining its 3dB bandwidth greater than 10 MHz. An exponential circuit is proposed to obtain the dB-linear control characteristics. The non-ideal effects on dB linearity are analyzed and the corresponding compensation methods are suggested. Simulation results based on a 0.35μm CMOS technology are presented to demonstrate the performance of the proposed dB-linear VGA.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; mobile communication; wideband amplifiers; 0.35 micron; 60 dB; CMOS technology; CMOS variable gain amplifier; dB-linear control characteristics; dB-linear variable gain amplifier; exponential circuit; predistortion compensation; wireless communication; Application software; Approximation error; Bandwidth; CMOS technology; Circuits; Dynamic range; Gain control; Linearity; Voltage; Wireless communication;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328319
