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10-Op Amps 2 - Operational Amplifiers Op-Amps Part 2 Fred...

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Operational Amplifiers: Op-Amps Part 2 © Fred Terry all, 2008 Fall, 2008 1
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Negative Feedback • Setup Circuit with Large Finite A. All of the following are equally good tests for negative feedback – Does Increasing Vo decrease Vd? – Does Increasing Vd decrease Vo? – Does Increasing A decrease Vd? R 1 R 2 R 1 R 2 - +- V in V o + V in V o + - + AV d V d + 2 - -
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Non-Inverting Op-Amp Most often drawn this way: R 1 R f V in V o +- V in V o + - R 1 R f 3
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Analysis V in V o R f R 1 4
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Thevenin Equivalent 5
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Analysis V in V o 1 in VV R + = ⎡⎤ = R f 1 o f in R R VVV −+ ⎢⎥ + ⎣⎦ == R 1 () 1 1 1 1 f o f in R R V R R VR + + 6
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Special Case: Follower V in R f V o 0 f R R 1 1 R →∞ V in V o 7
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Why Care About a Follower? eak Signal Source with high Thevenin Resistance Weak Signal Source with high Thevenin Resistance V o 10M Ω 0M V in + - 10M Ω Voltage Meter (perfect) 8
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Comparison Question V in V o V in R 1 R f V o with R f =R 1 ot worrying about the Minus Sign, Not worrying about the Minus Sign, Which Circuit is Better?
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