# 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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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

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

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

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

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

Op Amp Terminals 6

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

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

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

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

Op Amp Circuit 11

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

Difficulties 13 PS. Don’t forget about units!

Thevenin / Norton Equivalents 14

Superposition 15

Max Power Transfer 16

Questions? 17

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

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

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