Why is DC load line different from AC load line?

Discussion in 'Homework Help' started by hoyahoya7, Mar 5, 2009.

  1. hoyahoya7

    Thread Starter New Member

    Mar 5, 2009
    1
    0
    I know that Q-point is intersection of AC load line and DC load line.

    but!
    I don't know why DC load line is different from AC load line.

    I think that it means difference of resistance value.

    WHY???????????

    Help me~
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,898
    1,722
    It is not the resistance, but the AC impedance which is frequency dependent.
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    To echo what papabravo has stated, a device that exhibits an ac load-line in addition to a dc load-line possesses a load impedance that is not purely resistive.

    hgmjr
     
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