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An op amp circuit simulation

  1. May 2, 2012 #1
    hi everyone ,

    i solved a text book question which says :

    http://img268.imageshack.us/img268/8994/img1379sa.jpg [Broken]

    http://img685.imageshack.us/img685/3228/img1380z.jpg [Broken]

    and found analytically : ia = -470 uA, ib = 770 uA , ic = 22 uA, ig= 322 uA, is = 64.5 uA

    Ra= 1kohms, Rb=2kohms, Rc = 1.5 kohms, Rf= 210 kohms , Vo = 14.5 v

    and i simulate it by using multisim as shown below :

    http://img32.imageshack.us/img32/8847/simue.png [Broken]

    the current (Is) looks different ! is there something wrong with simulation ? thanks : )
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. May 2, 2012 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Please show your equations for the results you got.
     
  4. May 4, 2012 #3
    ok ^^

    Here is my solution :

    http://img526.imageshack.us/img526/3480/ee1c.jpg [Broken]

    http://img444.imageshack.us/img444/1305/ee2f.jpg [Broken]

    hope it's clear :) thanks
     
    Last edited by a moderator: May 6, 2017
  5. May 4, 2012 #4
    => Vn = 29/30 v and Vo = 14.5 v

    => I s = ( Vn - 0 ) / 15k = 64.44 uA

    I a = ( Va - Vp ) / 1k = -466.67 uA

    I b = (Vb - Vp ) / 2k = 766.67 uA

    I c = ( Vc - Vp ) / 1.5k = 22.2 uA

    I g = ( Vp - 0 ) / 3k = 322.2 uA
     
    Last edited: May 4, 2012
  6. May 4, 2012 #5
    any help ? thanks
     
  7. May 4, 2012 #6
    i got it ! thanks :)
     
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