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Supply voltages to N and P type semiconductors

  1. Oct 24, 2011 #1
    Ok, maybe someone can point me in the right direction ...hopefully anyway.

    I know this is probably a really stupid question, but as Mr Mackey in South Park said - "there are no stupid questions, just stupid people", so here it is.

    I was in class simulating N and P type CMOS devices using OrCAD. When I had the N type going, we supplied a positive voltage to it (0->5V sweep) and for the P type, we connected a negative voltage (0 -> -5V).

    So, simply, why is it a positive voltage for N type, and a negative voltage for P type.

    A basic question I am sure, but one I don't fully understand.

    Thanks in advance.

    Oh, sorry if this is explained somewhere ...I took a qucik look through the Transistor sticky at the top, but some of the links wouldn't open on this PCs

    Thanks again.

  2. jcsd
  3. Oct 24, 2011 #2


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    This can be a super in-depth question if one really wants to get into it. But this is a pretty good layman's answer:


  4. Oct 24, 2011 #3
    Actually, that's spot on!


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