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DC Sweep with PDP calculation

Logy91

Hello

I have designed a 16 bit adder and want to do a power supply variation and plot VDD Vs PDP. I have set up the sweep parameters alright but I can not figure out how to calculate PDP. When I try to calculate the current I get this error

*Error* ("eval" 0 t nil ("*Error* eval: not a function" IT("/R0/MINUS")))

Also when I try to calculate the propagation delay using the calculate I get 4ns, although when I can calculate visually it is much less this is the delay expression that I am using

delay(?wf1 v("/A(0)" ?result "dc"), ?value1 .6, ?edge1 "either", ?nth1 1, ?td1 0.0, ?wf2 v("/Cout" ?result "dc"), ?value2 .6, ?edge2 "either", ?nth2 1,  ?td2 0.0 , ?stop 4n, ?multiple nil)

Could you please help me with that.

I am a  student

Best regards

  • Andrew Beckett

    I don't know what you mean by PDP.

    For the IT error message, perhaps you can give the entire expression? Something looks rather odd there. Without more detail, I'm not sure how we could give more help on what is wrong with your delay calculation - you've really not provided enough information (please read the Forum Guidelines).

    Regards,

    Andrew.

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