# Op-Amp

Discussion in 'Electronics Homework Help' started by vick5821, Dec 17, 2012.

1. ### vick5821

700
0
Jan 22, 2012

How can I possible to solve such a question ? I am so blur in this op-amp chapter especially later on designing the input and output stage.

Any guideline ?

Thanks

2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,505
2,852
Jan 21, 2010
Question 2a should simply be by application of a memorised formula.

For the other questions:

Do you have the general equation for the op-amp?

Can you determine the non-inverting input voltage with respect to the output?

Can you combine both of these in such a way as to answer the questions?

3. ### vick5821

700
0
Jan 22, 2012
I don't have any notes and guidance

I am totally lost

4. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,505
2,852
Jan 21, 2010
You *must* have an equation that defines the output voltage in terms of the gain and the difference between the inputs.

If you don't have that you can't do the latter parts of the question.

After learning that, there would have been some mathematics showing that as the gain approaches infinity, the characteristics of certain simple circuits are much reduced in complexity.

You need to go through your text and look for these.

Once you've found them, the answer should be very similar to some of the worked examples.

5. ### vick5821

700
0
Jan 22, 2012
I dont have text. My lecturer didnt use any text sad case