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Lecture 7: Op Amps Intro & Midterm I Review Nilsson & Riedel 5.1-5.3 ENG17 (Sec. 2): Circuits I Spring 2014 1 April 22, 2014

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Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Midterm Review 2

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Usage: Strain Gauge Measure strain by measuring change in resistance Problem: hard to measure tiny resistance change 3

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How to Measure Measure voltage across Wheatstone bridge Voltage still a small quantity …Use an Op Amp to amplify the voltage! 4 Op Amp = Operational Amplifier Indicates potential to perform math operations Indicates potential to amplify input signals

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Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Midterm Review 5

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Op Amp Terminals 6

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Terminal Voltage / Current 7 Follows the Node-Voltage Setup All currents set up as going into the “black box”

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Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Midterm Review 8

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Voltage Transfer Characteristic 9 A = gain (multiplying constant) Use “negative feedback” to stay in linear region

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Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Midterm Review 10

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Op Amp Circuit 11

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Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Midterm Review 12

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Difficulties 13 PS. Don’t forget about units!

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Thevenin / Norton Equivalents 14

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Superposition 15

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Max Power Transfer 16

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Questions? 17

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Extra Office Hours Tomorrow, Wednesday, 5-7pm Kemper 3101 18

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Recap Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Midterm Review 19

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