Practical Op Amp uA741

Discussion in 'Homework Help' started by prescott86, Mar 28, 2009.

  1. prescott86

    Thread Starter New Member

    Mar 28, 2009
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    Referring to the attachment, value of Vo and Ib can be obtained from pspice simulation. My question is, how I'm going to calculate Vio? Since Rc(R1 // Rf) is implemented, do i need to consider Vos due to input offset current?

    Thanks for reading this, any help would be highly appreciated.
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    I can't seem to open the attachment you have provided. Are you able to open it and see its contents?

    hgmjr
     
    Last edited: Mar 29, 2009
  3. prescott86

    Thread Starter New Member

    Mar 28, 2009
    3
    0
    yes, it's a pdf file. Let me upload jpg for u as well.
     
  4. prescott86

    Thread Starter New Member

    Mar 28, 2009
    3
    0
    Any helping hands pls?


    Thanks
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    First, something a bit more readable, I'll think about it...

    [​IMG]

    I'm not sure what parameter you are refering to as Vio, but I would say what I'm seeing is offset. Try adding a offset pot and see.
     
    Last edited: Mar 29, 2009
  6. hgmjr

    Moderator

    Jan 28, 2005
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    I suspect that once you get down to values of currents in the nanoamps and picoamps you start encountering rounding errors in the circuit analysis program. I believe this is the reason that the application of normal opamp circuit analysis begins to yield conflicting results when compared with the simulation.

    hgmjr
     
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