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Introduction to Operational Amplifiers | Ideal Circuits & Applications

Understand operational amplifiers, analyze ideal operation, use in practical circuits, and explore various configurations like inverting, non-inverting, summing, and difference amplifiers.

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Introduction to Operational Amplifiers | Ideal Circuits & Applications

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  1. E E2415 Lecture 05 - Introduction to Operational Amplifiers

  2. Operational Amplifiers • Ideal operational amplifiers are easily analyzed • Assumptions for ideal operation are realistic • Inexpensive commercial Op-Amps available as integrated circuits • Practical applications for instrumentation, signal processing and control circuits

  3. mA741 Pinout

  4. Op Amp Terminals

  5. Op Amp Terminal Currents

  6. Op Amp Terminal Voltages

  7. Equivalent Circuit

  8. Assumptions for Ideal Op Amp • Open loop Gain, A    vp - vn  0 • Then vp - vn  0  Ri   • Ri    ip  0 and in  0 • Gain is linear up to the saturation voltage • Saturation voltage equals power supply voltage

  9. Open-Loop Characteristics

  10. Inverting Amplifier Vn = 0 and in = 0. Then KCL at node n yields: and

  11. Saturated Mode • Inverting Amplifier with +Vcc = 5 V and Vcc = -5V. • Rf = 10 k and Rg = 1 k

  12. Non-Inverting Amplifier vn = vp = vg KCL at node n:

  13. Summing Amplifier (1/2)

  14. Summing Amplifier (2/2)

  15. Difference Amplifier (1/3) KCL @ n:

  16. Difference Amplifier (2/3) Voltage Divider @ p:

  17. Difference Amplifier (3/3) Substitute: into: and simplify: If: Then:

  18. Analyzing an OpAmp Circuit

  19. Analyzing an OpAmp Circuit

  20. Analyzing an OpAmp Circuit

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