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Op-Amp Based Circuits

Op-Amp Based Circuits . Section 8.2 . Topics. Non-Inverting Amplifier Inverting Amplifier Integrator Differentiator. Non-Inverting Amplifier (Ideal). (Assumption: A o is infinite). Non-Inverting Amplifier (Practical). Approximation. (Large, since Ao is large). (Taylor series

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Op-Amp Based Circuits

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  1. Op-Amp Based Circuits Section 8.2

  2. Topics • Non-Inverting Amplifier • Inverting Amplifier • Integrator • Differentiator

  3. Non-Inverting Amplifier (Ideal) (Assumption: Ao is infinite)

  4. Non-Inverting Amplifier (Practical)

  5. Approximation (Large, since Ao is large) (Taylor series approximation)

  6. Example

  7. Application of Inverting Amplifier • Analog Filters • Control Systems

  8. Inverting Amplifier Input impedance: R2 Trade off: Input impedance versus voltage gain.

  9. Virtual Ground Versus An Ordinary Ground Node X is a virtual ground, but not an ordinary ground. If X were an ordinary ground, current from Vin would be diverted from R1since R1 represents a path of high impedance.

  10. Practical Inverting Amplifier (Equating current in R1 and R2)

  11. Example

  12. Generalized Inverting Amplifier

  13. Integrator Analysis in the Frequency Domain (Pole at the origin)

  14. Frequency Response of Integrator (Pole at the origin) (Pole frequency is obtained by setting the denominator to zero)

  15. Integrator Analysis in the Time Domain

  16. Example

  17. Active Integrator Versus Passive Integrator (Active integrator) (Passive integrator) Current decreases as Vout rises, leading to a slower increase in Vout. Passive integrator approximates the behavior of an active integrator.

  18. An Integrator with Finite Gain

  19. Example

  20. Frequency Domain Analysis of Differentiator Frequency Domain Analysis

  21. Time Domain Analysis of a Integrator Time Domain Analysis

  22. Example

  23. Active Differentiator Circuit Versus Passive Differentiator Circuit Node X is not pinned to ground. Capacitor can not charge instantaneously. Therefore, Vout rises rapidly to V1 initially.

  24. Practical Differentiator

  25. Example

  26. Voltage Adder (Application:Noise Cancellation)

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