10-Op Amps 2 updated

10-Op Amps 2 updated - Operational Amplifiers Op-Amps Part 2 Fred Terry Fall 2008 2008 1 Negative Feedback Setup Circuit with Large Finite A All of

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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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xample Values Example Values R1 R2 1.00E+05 4.00E+05 in d out ain Error| % () 2 12 1 di n R vV v AR R AR V ⎡⎤ =− ⎢⎥ ++ ⎣⎦ Vin A Vd Vout |Gain Error| % 11 0 2.67E 01 2.666667 3.33333E+01 1 100 3.81E 02 3.809524 4.76190E+00 1 1000 3.98E 03 3.980100 4.97512E 01 2 1 oi n VV R 1 1.00E+04 4.00E 04 3.998001 4.99750E 02 1 1.00E+05 4.00E 05 3.999800 4.99975E 03 1 1.00E+06 4.00E 06 3.999980 4.99998E 04 R 1 R 2 R 1 R 2 - +- V in V o + V in V o + - + AV d V d + 3 - -
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Finite Gain Inverting Op-Amp with R =100K Ω R =400K Ω 1 2 |Gain| 10 0 10 0 10 2 10 4 10 6 10 8 10 10 10 0 |v d /V in | |Gain Error| (%)| 10 0 10 2 10 4 10 6 10 8 10 -10 4 Op-Amp Open Loop Gain (A)
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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 5
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eal Op- mp Analysis: se Ideal Op Amp Analysis: Use Nodal Analysis at Inputs V in V o R f R 1 6
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Thevenin Equivalent 7
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This note was uploaded on 01/31/2011 for the course EECS 215 taught by Professor Phillips during the Spring '08 term at University of Michigan.

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10-Op Amps 2 updated - Operational Amplifiers Op-Amps Part 2 Fred Terry Fall 2008 2008 1 Negative Feedback Setup Circuit with Large Finite A All of

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