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A Single-Stage 35dB-Linear Digitally-Controlled Variable Gain Amplifier for Ultrasound Analog Front End

Title
A Single-Stage 35dB-Linear Digitally-Controlled Variable Gain Amplifier for Ultrasound Analog Front End
Authors
조성은
Date Issued
2014
Publisher
포항공과대학교
Abstract
This research presents a variable gain amplifier(VGA) for an analog front-end(AFE) of ultrasound imaging machine. The VGA receives an echo signal from LNA, and amplifies the received echo signal for time-gain compensation. The proposed VGA controls 35dB voltage gain in a single stage, and has a large output swing. The proposed VGA has been designed by using a 0.35um CMOS process. The VGA consumes 1.71mW with 3.3V supply. In the post-layout simulation, HD3 of -66.84 dB is achieved for the output voltage swing of 0.9 Vpp. The linear-in-dB gain range is [-17, 18] dB with 16steps. The maximum gain error and the bandwidth of VGA are 1.67dB and 11MHz, respectively.
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001677250
http://oasis.postech.ac.kr/handle/2014.oak/2189
Article Type
Thesis
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