AC Load Line

Discussion in 'Homework Help' started by chaosweapon, May 3, 2009.

  1. chaosweapon

    Thread Starter Member

    Nov 14, 2008
    15
    0
    Is the AC Load Line of the Common Collector calculated in the same way as that of the Common Emitter?

    ie are the following equations applicable to CCs:
    ic(sat) = IC + VCE/(RE//RL)
    vce(cutoff) = VCE + IC(RE//RL)

    If not, what are the correct equations?

    And what about a swamped Common Emitter?
     
  2. PRS

    Well-Known Member

    Aug 24, 2008
    989
    35
    Your questions confuse me. Here's a CC amp with its load line. Hope it helps!
     
  3. chaosweapon

    Thread Starter Member

    Nov 14, 2008
    15
    0
    Thanks. That means that those equations are also valid for CCs.

    Edit: You posted the DC Load Line. How would the AC load line be for that circuit?
     
    Last edited: May 3, 2009
  4. chaosweapon

    Thread Starter Member

    Nov 14, 2008
    15
    0
    Could it be possible that the Common Collector does not have a load line?
     
  5. PRS

    Well-Known Member

    Aug 24, 2008
    989
    35
    You brought up a good point. I've never worried about loadlines with CCs. I suppose the AC and DC loadlines are the same because there is no gain. The signal merely rides on top of the DC voltage Ve. On the load diagram you can envision a sine wave riding to the left and right of the Ve point. Note that if Ve is right in the middle then clipping only occurs when the signal crosses either Vcc or ground.
     
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