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Operational Amplifiers (Op Amps)

Operational Amplifiers (Op Amps). Adnan Pandjou Hunter Moore Tyler Randolph. Agenda. Background Ideal Op Amp Inverting Non-inverting Integrating Differential Summing Applications Conclusion. Background.

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Operational Amplifiers (Op Amps)

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  1. Operational Amplifiers(Op Amps) Adnan Pandjou Hunter Moore Tyler Randolph

  2. Agenda • Background • Ideal Op Amp • Inverting • Non-inverting • Integrating • Differential • Summing • Applications • Conclusion

  3. Background • Originally designed to perform mathematical operations in 1940 using vacuum technology • The first integrated op-amp to become widely available was produced in the late 1960’s by Fairchild • Wide variety of applications, low cost, and easily manufactured

  4. Ideal Op Amp

  5. InvertingOp Amp

  6. Non-inverting

  7. Integrating Inverting op-amp feed back resistor replaced with a capacitor Input voltage is integrated by using a capacitor Smoothes out signals and helps to remove offset Used for PID controllers

  8. Differential If all of the resistors are equal, the differential op-amp becomes a difference amplifier Vout=V1-V2 If R4=R3 and R2=R1, then it becomes amplified difference op-amp Vout=(V2-V1)R3/R1

  9. Summing Summing amplifiers combine signals by adding directly or scaling and then adding If all resistors are equal Audio mixers sum several signals with equal gains Digital-to-analog converters use different resistors to give a weighted sum LED’s use summing amps to apply a DC off set to AC voltage to keep it in its linear operating range

  10. Applications • Low Pass Filters • High Pass Filters • Offset Comparator • Data acquisition

  11. Low Pass Filter • Used to filter frequencies above fc • Second order • Active

  12. High Pass Filter • Used to filter frequencies below fc • Second order • Active • C2 and R2 switched

  13. If Output = 0V If Output = 5V Offset Comparator • Good for setting thresholds

  14. Offset ComparatorExample IR detector • Setting thresholds for IR detector Op-amp R1 R2

  15. Data acquisition • Signal amplification • Example (Lab 2)Amplification of strain gage signal

  16. Example Data acquisition Differential Circuit

  17. Where to get Op-ampsfor Free • Companies give free sampleswww.national.com

  18. Where to get Op-ampsfor Free • 5 (max 5 of each kind) samples per week

  19. Design tools

  20. Design tools

  21. Design tools

  22. Design tools Parts List

  23. Design tools Design simulation

  24. Conclusion • Wide range of application • Lots of recourses • Look at other previous student presentations

  25. Questions?

  26. Appendix

  27. Inverting i2 ia i1 VA VB

  28. Non-Inverting VA

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