Title :
CMOS current-mode exponential-control variable-gain amplifier
Author :
Chang, C.-C. ; Lin, M.-L. ; Liu, S.-I.
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
7/5/2001 12:00:00 AM
Abstract :
A CMOS current-mode exponential-control variable-gain amplifier is presented. It consists of a first-order current-mode pseudo-exponential circuit and a current-mode multiplier. Based on the Taylor´s series expansion, the pseudo-exponential circuit can be realised by MOSFETs in saturation. The proposed circuit has been fabricated in a 0.5 μm n-well CMOS process with a gain control range of 15 dB. The experimental results confirm the feasibility of the proposed variable-gain amplifier
Keywords :
CMOS analogue integrated circuits; amplifiers; current-mode circuits; gain control; 0.5 micron; CMOS VGA; CMOS variable-gain amplifier; Taylor series expansion; current-mode multiplier; current-mode pseudo-exponential circuit; exponential control; first-order pseudo-exponential circuit; n-well CMOS process;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20010593
