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Op-Amp Explorations

Op-Amp Explorations. Mike Farrell 3/30/2011. Outline. Goals and Setup Op-Amp Input current Simple Inverting Amp Simple Non-Inverting Amp Combine the two Non-Ideal Analysis. Goals. Prove that the ideal Op-Amp model is valid

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Op-Amp Explorations

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  1. Op-Amp Explorations Mike Farrell 3/30/2011

  2. Outline • Goals and Setup • Op-Amp Input current • Simple Inverting Amp • Simple Non-Inverting Amp • Combine the two • Non-Ideal Analysis

  3. Goals • Prove that the ideal Op-Amp model is valid • Prove that the non-ideal model is more accurate but not necessary. • Demonstrate how to hook up Op-Amp circuits

  4. Setup • All Circuits use a LM741C opamp • Power Supply is +- 15V • Ideal Constraints • In=Ip=0 • Vn=Vp • Av=Inf • Rin=Inf • Ro = 0

  5. Op-Amp Input Current Circuit

  6. Input Current Results • Measured Vp and Vn. • I=(0-Vx)/100K (Passive Sign Convention) • All measurements are within spec for data sheet and very close to ideal.

  7. Inverting Op-Amp Circuit

  8. Non-Inverting Op-Amp Circuit

  9. Non-Inverting/Inverting Results

  10. Combo Op-Amp Circuit Combination of Inverting and Non-Inverting Amplifiers

  11. Combo Op-Amp Results with Non-Ideal Calculations

  12. Non-Ideal Circuit used for Calculations

  13. Conclusions • In and Ip <50nA (~0A) • Vn = Vp • Using realistic Av, Rin, and Ro does not have a significant effect on voltage error. • Vout errors all less than 1% from ideal

  14. Slide 14 Questions?

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