command to measure noise margin

Discussion in 'Cadence' started by prakash.na, Oct 9, 2006.

  1. prakash.na

    prakash.na Guest

    Hi all,
    I want to automate the measurement of vil,vih,vol,voh. I tried to sweep
    i/p
    'pad' and try to find the value of 'pad' at which derivative of output
    'din' is unity.
    ..meas vil find v(pad) when deriv(v(din)) = 1
    But the command is not working.
    Also, since there are two such unity slopes, could anyone tell how can
    we
    differentiate them to get Vil & Vih. I feel for Vol/Voh, we can repeat
    the measure statements, by just changing v(pad) to v(din).

    Please comment on the above and inform, if anyone knows how to get
    vil,vih,vol,voh, by commands in spice.

    Regards
    Prakash
     
    prakash.na, Oct 9, 2006
    #1
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