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PSpice - Gates - worst-case output level question

Discussion in 'CAD' started by Active8, Jan 26, 2004.

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  1. Active8

    Active8 Guest

    Hi:

    I'd like to know how to get a gate sim to output other values like
    Vol max and Voh min and even sweep the levels.

    How do you do that?
     
  2. Jim Thompson

    Jim Thompson Guest

    I think the digital simulator simply does delay testing.

    To do VOL-max and VOL-min requires ANALOG simulation ;-)

    I do it all the time at the device level.

    Over the years I've redesigned *many* Motorola/ON-Semi 'HC parts... a
    job strictly for an ANALOG designer ;-)

    ...Jim Thompson
     
  3. Active8

    Active8 Guest

    Looks that way so far.
    ^^^^^ Voh-min ;)

    It's mixed analog and digital. The digital device has an analog
    interface and that interface may or may not be tweakable.
    And that's what I'll end up doing if nothing else turns up. A
    voltage source is all that's really needed for this case, but give
    me a hint, please. What would you do if you needed to sweep a CMOS
    output over its tolerance range? E.g., Voh = Vdd - 0.7 min Vol = .6
    max.
     
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