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?
MIT 6.002 Circuits and Electronics, Spring 2007
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The image from the url, but i will attach it here again.
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Does anybody know what is the fee for getting certificate from MITx and when exactly is to pay?
i thought that the certificate is free... ?!
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.