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IEE-Lec4 Op-Amps

# IEE-Lec4 Op-Amps - Lecture 4 Operational Amplifiers What...

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05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 1 Lecture 4: Operational Amplifiers What can you do with infinite gain?

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05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 2 Some History Fairchild 1964: The First Linear IC The µA702 Op-Amp 12 Transistors Designer: Bob Widlar 1965: A Best-Seller The µA709 Op-Amp 14 Transistors Designer: Bob Widlar 0.60 Inches
05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 3 2 Minute Quiz Name_______ Section________ Date_________ What is the voltage measured by the blue probe? R1 90k V1 10V R2 10k V V 0 V

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05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 4 What can you do with infinite gain? The goal of amplifier designers: huge gain. What are the problems and opportunities associated with infinite gain? First, we need a model.
05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 5 Op-Amp

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05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 6 Ideal Op-Amp Model Gain is infinite Input resistance is infinite Output resistance is zero Input voltage is zero Input current is zero A V V V V V O U T O U T I N = - = + - R I N R O U T = 0 V I N = 0 I + = 0 I - = 0
05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 7 Ideal Op-Amp Continued Bandwidth is also infinite. Thus, an ideal op-amp works the same at all frequencies.

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05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 8 Feedback Like most engineered systems, the op- amp uses feedback to realize its potential value. Feedback comes in two forms Positive Feedback Negative Feedback It seems like positive feedback might be best, but negative feedback makes the op-amp work
05/08/09 Introduction to Engineering Electronics STOLEN FROM K. A. Connor 9 Feedback Examples From a Zoology Course You just ate a Krispy Kreme donut and your blood glucose levels are on the rise. In response to this rise, the pancreas is releasing insulin into the blood stream stimulating storage of glucose.

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IEE-Lec4 Op-Amps - Lecture 4 Operational Amplifiers What...

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