Title :
A CMOS dB-linear variable amplifier using curvematching
Author :
Qi Yu ; Wen Luo ; Ning Ning ; Zhenya Sun ; Chengbi Wang ; Yong Hu ; Tianzhu Li
Author_Institution :
State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A CMOS dB-linear Variable Gain Amplifier (VGA) using Curvematching is presented. The CMOS dB-linear VGA provides a variable gain of 59 dB while maintaining -3 dB bandwidth greater than 86 MHz. Curvematching is proposed to obtain the dB-linear gain control characteristics based on a low-distortion source-degenerated differential amplifier structure. Nonideal effects on dB linearity are analyzed and the methods for improvement are suggested. The VGA is designed in a 0.13 μm CMOS technology and the post-simulation results demonstrate the good dB linearity, good property of total harmonic distortion and noise figure.
Keywords :
CMOS analogue integrated circuits; curve fitting; differential amplifiers; gain control; CMOS dB-linear variable amplifier; curvematching; dB-linear gain control; gain 59 dB; low-distortion source-degenerated differential amplifier structure; variable gain amplifier; Bandwidth; CMOS integrated circuits; CMOS technology; Gain; Linearity; Transistors; Voltage control; Cascade Amplifier; Curvematching; Noise Figure; Total Harmonic Distortion; dB-linear Variable Gain Amplifier (VGA);
Conference_Titel :
Mechatronic Science, Electric Engineering and Computer (MEC), 2011 International Conference on
Conference_Location :
Jilin
Print_ISBN :
978-1-61284-719-1
DOI :
10.1109/MEC.2011.6025969
