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Abstract
A dB meter is used to compress the large dynamic range of a signal. A logarithmic amplifier based on the exponential v-i characteristic of a p-n junction can be used for dB conversion. However, the p-n junction is too sensitive to temperature variations and, therefore, requires temperature compensation. In the proposed dB meter, we use an exponential waveform which does not depend upon the device parameters. The effect of temperature variations in RC values is eliminated by using a well-regulated reference source.
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T S Rathore
T S Rathore, Chairman, IETE Mumbai Centre is Professor in the Deptt of Electrical Enngineering in IIT Bombay since 1986. He is a Fellow of IETE and has been Hony Secretary of Mumbai Centre during 1999–2000. Born on October 29, 1943, obtained BSc (Engg), ME and PhD degrees all from the University of Indore. He served in G S Institute of Technology & Science, Indore from 1965–1978 and joined IIT Bombay in 1978 as Assistant Professor. He was a Post-Doctoral Fellow at the Concordia University, Montreal during 1983–1985 and visiting researcher at the University of South Australia, Adelaide in 1983. He has published around 180 papers in national and international research journals, is recipient of IETE-MN Saha Memorial Award for best application oriented paper in 1995. He was the Guest Editor of the Special Issue on Instrumentation Electronics of the Journal of the IE (ET Section) in 1991. He is the author of the book ‘Digital Measurement Techniques’ published in 1996 by Narosa Publishers, New Delhi. He is a senior member of IEEE (USA), a Fellow of IE (I) and a life member of ISTE(I). He is General Chairman of International Conference ICQRC 2001 to be held in December 2001. He is also Co-ordinator for writing the solutions for DipIETE question papers and Convenor of Telephone Advisory Committee since last 12 years at IIT Mumbai.