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Phase question

  1. Sep 11, 2007 #1
    1. The problem statement, all variables and given/known data
    If I have a transfer function [tex]H(jw)= |\frac{V_o}{V_i}|[/tex]. I need to find the phase difference between Vo and Vi.

    2. Relevant equations

    3. The attempt at a solution
    The phase angle is [tex]tan^{-1}(\frac{Im(H)}{Re(H)})[/tex]. My problem is that if I get a positive angle, does this mean that the Output leads or lags the input? I can't find this explained clearly in any text.
  2. jcsd
  3. Sep 11, 2007 #2


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    A positive phase difference is a lead. A negative phase difference is a lag.
  4. Sep 11, 2007 #3


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  5. Sep 11, 2007 #4
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