How can a paradox be deceptive? What appears to be an obvious conclusion may not be correct after all! This is illustrated with the help of a differential amplifier circuit, whose gain is actually half of what it appears to be. This paradox is indeed deceptive. See for yourself and decide if you wish to agree or not.
Source: S. C. Dutta Roy, “Appearances can be Deceptive: A Circuit Paradox,” Students’ Journal of the IETE, vol. 37, pp. 79–81, July–September 1996.
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S.G. Burns, P.R. Bond, Principles of Electronic Circuits (West Publishing Co, St Paul, USA, 1987)
A.S. Sedra, K.C. Smith, Microelectronic Circuits (Sanders College Publishing, Fort Worth, USA, 1992)
J. Millman, A. Grabel, Microelectronics, 2nd edn. (McGraw Hill, New York, 1987)
Acknowledgements
Acknowledgement is due to my students in the EE204 N class, to whom I had posed this paradox as a challenge during the semester commencing January 1996. Special mention must be made of Ankur Srivastava, Atul Saroop and Ram Sadhwani whose enthusiastic participation in the resolution of the paradox made it an enjoyable experience for me.
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Dutta Roy, S.C. (2018). Appearances Can Be Deceptive: A Circuit Paradox. In: Circuits, Systems and Signal Processing. Springer, Singapore. https://doi.org/10.1007/978-981-10-6919-2_9
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DOI: https://doi.org/10.1007/978-981-10-6919-2_9
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