lecture-11-14 - 11/14/2011 ME-340 Tentative class forecast...

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11/14/2011 1 ME-340 Lecture # 32 2010.11.14 Tentative class forecast Week 11/14 Feedback for final stretch/exam Finalize Ch 14 Ch 15 (Electromagnetism) Week 11/21 Ch 15/16 Week 11/28 Ch 16/17 Quiz on Chs. 14, 15 Final exam on Th 12/8 7-10pm (Chs. 16, 17) 2 Reminder Problem Homework (Due We 11/16 in class) Hambley 5 th edition, Chapters 14, Problems: Non-inverting amplifiers: p14.24, p14.26 Design: p14.36 Imperfections in linear range: p14.48 3 Review Session Weekly, Wednesdays, 3-4 ETC 2.108 4
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11/14/2011 2 Short survey Exam difficulty Exam time Effectiveness of review sessions Effectiveness on problem solving in class Effectiveness on reduced material Suggestions 5 Recap Wednesday 6 Positive Feedback Op-Amp Undesirable Configuration: Output v o Quickly Saturates since + feedback increases input Positive feedback: output applied back to non- inverting (+) input via R 2 Non-inverting Op-Amp Negative feedback: output back to inverting input via R 2 Input @ + terminal
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11/14/2011 3 Voltage Follower (Unity Gain) Previous analysis, voltage gain : A v V o V in R 1 R 2 R 1 1 R 2 R 1 But R 2 0, thus A v 1 R2=0 Unity Gain Signal Conditioning OpAmps Voltage followers Differencing OpAmp Difference amplifier 11 Today 12
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11/14/2011 4 Schedule: 2 nd Phase 13 p14.23 b 14 Resistances Too Small Cause Large Currents in Op-Amp Resistances Too Large Cause Stray Capacitance Noise in Op- Amp & generate ‘’thermal noise’’ Rule: Use 100 to 1M Resistances in Op-Amp Designs. 1 2 1 2 1 1 A R R R R R V V in o v Amplifier Design Considerations Problem Statement: Design Amplifier with Gain of -10 5% using Nominal Resistance Values in 0 to 500 Range Amplifier Design (Tolerances)
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This note was uploaded on 02/07/2012 for the course M E 340 taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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lecture-11-14 - 11/14/2011 ME-340 Tentative class forecast...

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