Bandgap voltage reference
Reference voltage independent of temperature / From Wikipedia, the free encyclopedia
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A bandgap voltage reference is a voltage reference circuit widely used in integrated circuits. It produces an almost constant voltage corresponding to the particular semiconductor's theoretical band gap, with very little fluctuations from variations of power supply, electrical load, time, temperature (as of 1999[update], they typically have an initial error of 0.5–1.0% and a temperature coefficient of 25–50 ppm/°C).[1]
David Hilbiber of Fairchild Semiconductor filed a patent in 1963[2] and published this circuit concept in 1964.[3] Bob Widlar,[4] Paul Brokaw[5] and others[6] followed up with other commercially-successful versions.