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Chapter 2 – Operational Amplifiers PowerPoint Presentation
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Chapter 2 – Operational Amplifiers - PowerPoint PPT Presentation

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Chapter 2 – Operational Amplifiers

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  1. Chapter 2 – Operational Amplifiers Introduction http://engr.calvin.edu/PRibeiro_WEBPAGE/courses/engr311/Handouts/OpAmp-tutorial-1.ppt Textbook CD http://www.clarkson.edu/%7Esvoboda/eta/designLab/InvertingAmplifierDesign.html

  2. The OP-AMP Terminals Symbol Power Supplies

  3. Fairchild uA702 – The first op-amp designed by Bob Widlar

  4. The OP-AMP Terminals

  5. The OP-AMP Terminals

  6. _ i(-) Inverting RO A vid Output Ri vO = Advid Noninverting i(+) + -VS The Ideal OP-AMP Open-loop gain Exercise 2.2

  7. Analysis of Circuits Containing Ideal OP-AMPS The Inverting Configuration Closed-Loop Gain Virtual Short-Circuit Virtual Ground Negative and Positive Feedback The inverting closed-loop configuration.

  8. Analysis of Circuits Containing Ideal OP-AMPS The Closed-Loop Gain - Analysis of the inverting configuration

  9. Analysis of Circuits Containing Ideal OP-AMPS Effect of Finite Open-Loop Gain

  10. Analysis of Circuits Containing Ideal OP-AMPS Exercise 2.1

  11. Analysis of Circuits Containing Ideal OP-AMPS Input and Output Resistances

  12. Analysis of Circuits Containing Ideal OP-AMPS Exercise 2.2

  13. Other Applications of the Inverting Configuration With General Impedances Z2 Z1

  14. Other Applications of the Inverting Configuration The Integrator

  15. Other Applications of the Inverting Configuration PSpice Simulation Tips

  16. Other Applications of the Inverting Configuration The Differentiator Z2 = R Z1 = 1/sC

  17. Other Applications of the Inverting Configuration The Weighted Summer

  18. Other Applications of the Inverting Configuration The Non-Inverting Configuration vi

  19. Other Applications of the Inverting Configuration The Voltage Follower

  20. Other Applications of the Inverting Configuration The Difference Amplifier A difference amplifier.

  21. Other Applications of the Inverting Configuration The Difference Amplifier Applications of superposition to the analysis of the current circuit of Fig.. 2.21.

  22. Other Applications of the Inverting Configuration The Difference Amplifier – Input Resistances Finding the input resistance of the difference amplifier.

  23. Other Applications of the Inverting Configuration The Difference Amplifier – Common-Mode and Differential Components of the input signal Representation of the common-mode and differential components of the input signal to a difference amplifier. Note that v1 = vCM - vd/2 and v2 = vCM + vd/2.

  24. Other Applications of the Inverting Configuration Instrumentation Amplifier (a) A popular circuit for an instrumentation amplifier. (b) Analysis of the circuit in (a) assuming ideal op-amps. (c) To make the gain variable, R1 is implemented as the series combination of a fixed resister R1fand a variable resistor R1v. Resistor R1fensures that the maximum available gain is limited.

  25. Effect Of Finite Open-Loop Gain and Bandwidth On Circuit Performance Open-loop gain of a typical general-purpose internally compensated op amp. fb = 3-db or break frequency ft = unity gain bandwidth

  26. (a) Unity-gain follower. (b) Input step waveform. (c) Linearly rising output waveform obtained when the amplifier is slew-rate limited. (d) Exponentially rising output waveform obtained when V is sufficiently small so that the initial slope (wtV) is smaller then or equal to SR.

  27. Effect of slew-rate limiting on output sinusoidal waveforms.