Lecture 8: Op Amps and Circuits Nilsson

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Presentation transcript:

Lecture 8: Op Amps and Circuits Nilsson 5.1-5.6 ENG17: Circuits I Spring 2015 April 23, 2015

Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Amplifier Circuits

Usage: Strain Gauge Measure strain by measuring change in resistance Problem: hard to measure tiny resistance change Δ𝑅=2𝑅 Δ𝐿 𝐿

How to Measure Measure voltage across Wheatstone bridge Voltage still a small quantity …Use an Op Amp to amplify the voltage! 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 Amplifier Circuits

Op Amp Terminals

Off-note Bob Widlar Co-creator (w/David Talbert) of first mass-produced op amps Also created this advertisement

Terminal Voltage / Current 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 Amplifier Circuits

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

Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Amplifier Circuits

Op Amp Circuit

Example – Op Amp

Overview Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Amplifier Circuits

Inverting Amplifier Circuit

Operating “Open Loop”

Noninverting Amplifier Circuit

Summing Amplifier Circuit

Difference Amplifier

Example

Example