1 / 20

E E 2415

E E 2415. Lecture 05 - Introduction to Operational Amplifiers. Operational Amplifiers. Ideal operational amplifiers are easily analyzed Assumptions for ideal operation are realistic Inexpensive commercial Op-Amps available as integrated circuits

wells
Download Presentation

E E 2415

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related