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Delay calculation for full adder circuit

KISHORE085

Hi all,

i've designed a full adder circuit in cadence virtuoso. i wanted to know how to calculate over all delay. i know how to calculate delay between two signals using calculator tool. But dont know to calculate over all delay. Please help.. . 

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  • Andrew Beckett

    This of course depends on how you are varying the inputs. If the input stimuli is under your control, then you know when it changes and so you probably don't even need to use the delay() function. You could use the cross function to look for a crossing event in a particular window of the input or output. Then the "overall delay" would be:

    max(crossOut1 crossOut2)-min(crossIn1 crossIn2 crossIn3)

    where each cross above is a cross expression on that output or input.

    Something like that.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    This of course depends on how you are varying the inputs. If the input stimuli is under your control, then you know when it changes and so you probably don't even need to use the delay() function. You could use the cross function to look for a crossing event in a particular window of the input or output. Then the "overall delay" would be:

    max(crossOut1 crossOut2)-min(crossIn1 crossIn2 crossIn3)

    where each cross above is a cross expression on that output or input.

    Something like that.

    Regards,

    Andrew.

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