Lecture 13-Fully differential amplifier

Lecture 13-Fully differential amplifier - Lecture 13 Fully...

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EE 214 Lecture 13 (HO#18) B. Murmann 1 Lecture 13 Fully Differential OpAmps and OTAs Boris Murmann Stanford University [email protected] Copyright © 2004 by Boris Murmann
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EE 214 Lecture 13 (HO#18) B. Murmann 2 Overview Reading 6.0, 6.1.1, 6.1.2, 6.1.2 (Basic Feedback Concepts) 12.1, 12.2, 12.3, 12.4 (Fully Differential OpAmps) Introduction – Having discussed the basic properties of ideal feedback loops, we will now take steps toward a practical implementation of feedback amplifiers in CMOS technology. The first amplifier we consider uses a very crude gain stage, composed of a simple differential pair and an active current mirror load. For the time being, we will use this crude topology as a vehicle to gain insight into terminology, analysis and design tradeoffs, before moving to more complicated circuits in future lectures.
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EE 214 Lecture 13 (HO#18) B. Murmann 3 Feedback Using Ideal OpAmp a f Σ v in v out - R 2 R 1 v in v out 2 1 1 R R R f + = ( ) + = v v g v out 1 2 1 2 1 1 1 1 R R R R R R g g af a v v in out + + + = + = g a =
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EE 214 Lecture 13 (HO#18) B. Murmann 4 Inverting Configuration Circuit does not map directly into generic block diagram – Cannot directly identify a and f –a g a f Σ v in v out - R 2 R 1 v out v in ? f = ( ) + = v v g v out ? a =
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EE 214 Lecture 13 (HO#18) B. Murmann 5 Superposition a f Σ v in v out - a f Σ v out - v test a af
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EE 214 Lecture 13 (HO#18) B. Murmann 6 Inverting Configuration R 2 R 1 v out v in R 2 R 1 v out v test g R R R a + = 2 1 2 g R R R af + = 2 1 1
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Lecture 13-Fully differential amplifier - Lecture 13 Fully...

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