h18_lecture13_2

# h18_lecture13_2 - EE 214 Lecture 13(HO#18 B Murmann 1...

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Unformatted text preview: 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 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. EE 214 Lecture 13 (HO#18) B. Murmann 3 Feedback Using Ideal OpAmp a f 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 = 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 v in v out- R 2 R 1 v out v in ? f = ( ) + = v v g v out ? a = EE 214 Lecture 13 (HO#18) B. Murmann 5 Superposition a f v in v out- a f v out- v test a af 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 EE 214 Lecture 13 (HO#18)...
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h18_lecture13_2 - EE 214 Lecture 13(HO#18 B Murmann 1...

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