It is shown that bias stability is the best with the four resistor circuit. A two-resistor BJT biasing circuit, which appears to be an attractive alternative to the familiar four resistor circuit, is shown to have serious limitations. It is also shown that even when augmented by one or two resistors, these limitations are only partially overcome and that the bias stability that can be achieved thereby is poorer than that of the four resistor circuit.
Source: S. C. Dutta Roy, “Appearances can be Deceptive: The Case of a BJT Biasing Circuit,” Students’ Journal of the IETE, vol. 37, pp. 3–6, January–June 1996.
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References
J. Millman, A. Grabel, Microelectronics (McGrawHill, New York, 1987)
S.G. Burns, P.R. Bond, Principles of Electronic Circuits (West Publishing Company, St. Paul, 1987)
A.S. Sedra, K.C. Smith, Microelectronic Circuits (Sanders College Publishing, Fortworth, 1992)
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Dutta Roy, S.C. (2018). Appearances Can Be Deceptive: The Case of a BJT Biasing Circuit. In: Circuits, Systems and Signal Processing. Springer, Singapore. https://doi.org/10.1007/978-981-10-6919-2_24
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DOI: https://doi.org/10.1007/978-981-10-6919-2_24
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