NDLI: A low-power method adding continuous variable gain to amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Halvorsrod, T. Birkenes, O. Eichrodt, C.
Copyright Year	2005
Description	Author affiliation: Dept. of Phys. Electron., Norwegian Univ. of Sci. & Technol., Trondheim, Norway (Halvorsrod, T.)
Abstract	A method adding continuous gain control to high performance amplifiers is suggested. Any high performance, fixed gain amplifier can adopt the proposed method without deteriorating the performance of the core amplifier. The method is based on the idea of introducing an additional, adjustable feedback path in parallel with a fixed feedback path. The additional, adjustable feedback path can be an active feedback cell compatible with the amplifier architecture used. A low noise transimpedance amplifier would for example require an additional adjustable transconductance cell with proper phase characteristics in parallel with the fixed feedback element used. By making the feedback factor of the adjustable feedback path proportional to the power consumption, extra power is only consumed when gain reduction is necessary. This feature is especially valuable in applications where gain reduction is necessary for a short period of time. One application having this feature is medical ultrasound imaging. The proposed method was originally developed for real-time 3D ultrasound imaging but is compatible with all systems requiring continuous gain control. A prototype circuit was designed were the dynamic range was increased 12dB for an amplifier having 58dB SNR over a bandwidth of 20MHz with a peak penalty of 46% increase in the power consumption from 412/spl mu/W to 663/spl mu/W. The prototype amplifier was design to work at frequencies in the low MHz range.
Starting Page	1593
Ending Page	1596
File Size	579128
Page Count	4
File Format	PDF
ISBN	0780388348
DOI	10.1109/ISCAS.2005.1464907
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-05-23
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Feedback Ultrasonic imaging Gain control Energy consumption Prototypes Performance gain Phase noise Low-noise amplifiers Transconductance Biomedical imaging ultrasound front-end Gain compensation gain control low power variable gain amplifiers
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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