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DC Sweep with PDP calculation

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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


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