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Lecture 8: Op Amps and Circuits Nilsson 5.1-5.6

Lecture 8: Op Amps and Circuits Nilsson 5.1-5.6. ENG17 (Sec. 1): Circuits I Summer 1 2014. July 3, 2014. Overview. Usage Op Amp Overview Fundamental Operation Basic Op Amp Circuit Amplifier Circuits. Usage: Strain Gauge. Measure strain by measuring change in resistance

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Lecture 8: Op Amps and Circuits Nilsson 5.1-5.6

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  1. Lecture 8: Op Amps and CircuitsNilsson 5.1-5.6 ENG17 (Sec. 1): Circuits I Summer 1 2014 July 3, 2014

  2. Overview • Usage • Op Amp Overview • Fundamental Operation • Basic Op Amp Circuit • Amplifier Circuits

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

  4. 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

  5. Overview • Usage • Op Amp Overview • Fundamental Operation • Basic Op Amp Circuit • Amplifier Circuits

  6. Op Amp Terminals

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

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

  9. Overview • Usage • Op Amp Overview • Fundamental Operation • Basic Op Amp Circuit • Amplifier Circuits

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

  11. Overview • Usage • Op Amp Overview • Fundamental Operation • Basic Op Amp Circuit • Amplifier Circuits

  12. Op Amp Circuit

  13. Example – Op Amp

  14. Overview • Usage • Op Amp Overview • Fundamental Operation • Basic Op Amp Circuit • Amplifier Circuits

  15. Inverting Amplifier Circuit

  16. Operating “Open Loop”

  17. Noninverting Amplifier Circuit

  18. Summing Amplifier Circuit

  19. Difference Amplifier

  20. Example

  21. Example

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