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Low-Power CMOS Variable Gain Amplifier with Wide Gain Range and dB-Linear Characteristic

Title
Low-Power CMOS Variable Gain Amplifier with Wide Gain Range and dB-Linear Characteristic
Authors
강지효
Date Issued
2011
Publisher
포항공과대학교
Abstract
This paper proposes a structure for an all-CMOS variable gain amplifier (VGA) which provides very wide gain range, small chip size and low power consumption. An exponential approximation function with a very wide decibel linear control range was utilized. The VGA is composed of two cascaded variable gain stages, a control stage and a current generator. The VGA has the maximum gain variation of 110 dB with a linearity error of less than ± 1 dB, 3-dB bandwidth of 10 MHz ~ 1.67 GHz and power consumption of 3.7 mW from a 1.2-V supply. This VGA topology that can provide a very wide gain variation and reduce power dissipation while occupying smaller chip size and featuring high linearity will be very useful in many applications.
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000000900627
http://oasis.postech.ac.kr/handle/2014.oak/1100
Article Type
Thesis
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