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

Discussion in 'Homework Help' started by tim_3491, Apr 20, 2008.

  1. tim_3491

    Thread Starter New Member

    Apr 1, 2008
    7
    0
    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.

    Thanks
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Check out section 16.5.1.1 in this document on opamps. It has the final answer


    hgmjr
     
  3. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    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.

    Steve
     
  4. Caveman

    Active Member

    Apr 15, 2008
    471
    0
    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."
     
  5. tim_3491

    Thread Starter New Member

    Apr 1, 2008
    7
    0
    I will use the document you have provided, hopefully it will work, thanks for your help
     
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