1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Homework Helper

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


    User Avatar
    Homework Helper

  5. Sep 11, 2007 #4
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Phase question
  1. Phase diagram question (Replies: 1)

  2. Phase Change Question (Replies: 5)