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Building and Understanding the 741 Op-Amp: Applications, Design, and Device Physics

This guide delves into the fundamentals of the 741 operational amplifier (op-amp), exploring its structure, internal components, and applications in active filtering. We examine the workings of bipolar junction transistors (BJTs) and their role in circuit design, including the implementation of 7400 gates like the 2-input NAND gate. The content also emphasizes practical skills such as breadboarding, PCB design, systematic circuit development, and the use of software tools like Matlab and Cadence for analytical calculations and prototype building.

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Building and Understanding the 741 Op-Amp: Applications, Design, and Device Physics

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Presentation Transcript

  1. Introdcution

  2. Applications of Op-Amps (Active filter) Question: How do you build a 741 op-amp? What is inside the package?

  3. 741 Op-Amp Bipolar junction transistor

  4. Order of Presentation • Diode • Device Physics • Circuit Design • Bipolar junction transistor • Device Physics • Circuit Design • Complementary Metal Oxide Semiconductor • Device Physics • Circuit Design

  5. Device Physics Electrons are injected into the BC junction Electrons are injected into the B; holes to the E. Electrons are swept across the reversed biased BC

  6. Bipolar Junction Transistor Implementation of 7400 Gate (We will learn to work with BJTs in ES230)

  7. 2-Input NAND Gate F can only be pulled down if both A=B=1. F will be pulled up if either A or B is 0 V.

  8. So far • Device Physics • Transistor level design • Build circuits using transistors • Using breadboard • On PCB

  9. Design Circuits Systematically • Analytical Calculation • Matlab • Using Cadence (Linux Based) • Build proto-type • Breadboard • PCB

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