A CMOS Automatic Gain Control Circuit for Biomedical Applications

Zhi Qiang Gao; Fu Xiang Huang; Jing Li; Liang Yin; Xiao Wei Liu

doi:10.4028/www.scientific.net/KEM.645-646.1308

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 645-646A CMOS Automatic Gain Control Circuit for...

A CMOS Automatic Gain Control Circuit for Biomedical Applications

Abstract:

In this paper, a low-voltage automatic gain control (AGC) circuits is presented. The proposed circuit uses a novel approximated exponential function to increase the dB-linear output range. The three-stage AGC is fabricated in 0.18μm CMOS technology and shows the maximum gain variation of more than 100dB and a 67dB linear range with linearity error of less than ±1dB. The range of gain variation can be controlled from 34 to 101dB. The AGC dissipates less than 2.3mA under 1.8V supply voltage while occupying 0.4mm² of chip area.

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Periodical:

Key Engineering Materials (Volumes 645-646)

Pages:

1308-1313

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.645-646.1308

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Online since:

May 2015

Authors:

Zhi Qiang Gao*, Fu Xiang Huang, Jing Li, Liang Yin, Xiao Wei Liu

Keywords:

Automatic Gain Control (AGC), CMOS Process, Exponential Approximation Function, Variable Gain Amplifier (VGA)

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