A CMOS dB-linear variable amplifier using curvematching

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 so...

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Bibliographic Details
Published in2011 International Conference on Mechatronic Science, Electric Engineering and Computer (MEC) pp. 2369 - 2372
Main Authors Qi Yu, Wen Luo, Ning Ning, Zhenya Sun, Chengbi Wang, Yong Hu, Tianzhu Li
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2011
Subjects
Bandwidth
Cascade Amplifier
CMOS integrated circuits
CMOS technology
Curvematching
dB-linear Variable Gain Amplifier (VGA)
Gain
Linearity
Noise Figure
Total Harmonic Distortion
Transistors
Voltage control
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Summary: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.
ISBN:1612847196
9781612847191
DOI:10.1109/MEC.2011.6025969