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Noise Margin

Discussion in 'CAD' started by [email protected], Oct 9, 2006.

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  1. Guest

    I'm working on characterizing io cells. I thought of measuring
    Vih,Vil,Voh,Vol. I'm confused with which method to follow. In some
    papers its said, negative unity slope method gives pessimistic results.
    The better method would be Maximum square method of measuring SNM. For
    io cells, had anyone done any analysis of this kind. I'm intersted in
    sample spice decks for measuring SNM using MSM.
    Also, in -ve unity slope method, does anyone know any in-built hspice
    commands for measuring -ve slopes/directly Vih/Vil. As I need to run
    for around 375 corners, I need some automated way of measuring these
    Also, I could measure Hysterisis in Schmit trigger inputs, but any
    automated way/measure commands for measuring Vih,Vil,Voh,Vol is there?.

    P.S: The io cells are not single inverters, they are composed of more
    Any help is appreciated.

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