OP Amp is this correct, and how do i solve.

Thread Starter


Joined Apr 1, 2008
Hi guys

I have attached what i have done so far. Page 3 shows my working and what i need is a function for Vin and Vout. Can anyone see if they can solve the last fraction part on page 3 (problem part)jpeg for me.




Joined Dec 27, 2007
Why not use Laplace for this? Have you used Laplace circuit analysis in the past? It's a bit easier to work with.

To get your TF, you just isolate the variables of interest on each side, common factor out, then divide.



Joined Apr 15, 2008
It took me way too long to see it, but you have a math error at the top of your last sheet.
You have I1 + I2 = I3 + I4, which is fine.
But for I4, you have substituted -Vout/4R. Your sign is wrong.
This should be Vout/4R.

Now your answer should jive with the "opamps for everyone" answer on page 16-30. Otherwise, just get the equation to the form Vout/Vin = ... That is your needed answer. Try to put it into the form of the "opamps for everyone."