h34_lecture26_2

h34_lecture26_2 - Lecture 26 Bandgap Reference Boris...

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EE 214 Lecture 26 (HO#34) B. Murmann 1 Lecture 26 Bandgap Reference Boris Murmann Stanford University murmann@stanford.edu Copyright © 2004 by Boris Murmann EE 214 Lecture 26 (HO#34) B. Murmann 2 Overview Reading – 4.4.3 (Temperature Insensitive Biasing) Introduction – In this lecture we will introduce the basic idea behind the frequently used "bandgap" voltage reference. Conceptually, a bandgap reference simply combines two quantities with opposite temperature behavior to generate a voltage with (approximately) zero TC.
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EE 214 Lecture 26 (HO#34) B. Murmann 3 Key Idea kT/q has a positive temperature coefficient – "PTAT" proportional to absolute temperature •V BE of a BJT decreases with temperature – "CTAT" complementary to absolute temperature Can combine PTAT + CTAT to yield an approximately zero TC voltage reference – Useful in circuits that require a stable reference voltage • E.g. A/D converters EE 214 Lecture 26 (HO#34) B. Murmann 4 Conceptual Block Diagram
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EE 214 Lecture 26 (HO#34) B. Murmann 5
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h34_lecture26_2 - Lecture 26 Bandgap Reference Boris...

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