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wannabeEE

Hello to everybody, i need some help to study about opamps, i will have some exams soon, and here is a circuit about i would have some questions, i know that the image is not very clear, and i'm really sorry about that, i hope you can read it: http://tinypic.com/view.php?pic=11v3cz5&s=5 . First question about this: what type of circuit is this?

  • 2 years ago
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  1. Tweedle_Dee
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    What image?

    • 2 years ago
  2. wannabeEE
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    The image from the url, but i will attach it here again.

    • 2 years ago
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  3. comsats
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    Why don`t you get help from the text book of Sir Anant? I think it may help you.

    • 2 years ago
  4. comsats
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    Does anybody know what is the fee for getting certificate from MITx and when exactly is to pay?

    • 2 years ago
  5. wannabeEE
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    i thought that the certificate is free... ?!

    • 2 years ago
  6. junglejim
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    To answer the OP's question, the circuit is what the first part of a very simple opamp looks like "under the hood". It shows how one can be made using bipolar junction transistors hooked up as a differential amplifier with a current source. It's missing the gain stage and the output push-pull stage needed to make an opamp though. If you want to learn about opamps, unless you already know a lot about BJT devices (and you probably don't; opamps are taught first because they're conceptually much simpler) you'll be better off ignoring the diagrams like this and going through the course text in the order presented. What takes a page of calculations using the underlying BJT models take just a single equation taking advantage of the ideal opamp model abstraction. Once you get a good feeling of how opamps actually work, you'll be much better able to digest how their idealized model is approximated using BJTs.

    • 2 years ago
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