transfer function for passive filter

Discussion in 'Homework Help' started by notoriusjt2, Nov 7, 2010.

  1. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
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    0
    [​IMG]

    the book gives me

    Laplace impedance for a capacitor is Z=V/I=1/Cs

    what is the Laplace impedance for an inductor? Z=Ls?

    so would Vout=(Zc/R+Zc+ZL)Ein
    (1/Cs)/(R+Ls+(1/Cs))
    im getting
    1/RCs+LCs for an answer
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The correct answers are d and e.
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    You are so close.

    hgmjr
     
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Mik3, Initially I thought as you did. On closer inspection I think you will find that answer e. does not equate to d.

    hgmjr
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Ohhh, yes you are right. The correct answer is d. The numerator of e should be 1/LC as for e to equal d.
     
  6. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Yeah. Like I said, I initially drew the same erroneous conclusion but then looked closer and realized my ooppss.

    hgmjr
     
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