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Accuracy of CROSS() function in Verilog-A

RFStuff

Dear All,

I am using cross() in verilog-A as below:-

 

vtol=1e-12;

@(cross(phase-10u,+1,ttol,vtol)) begin
       $strobe("TIME = %rs \n", $abstime);
     end

But when I checked the abstime, it is NOT exactly at 10u of phase but at 10.541u of phase. This error is much larger than my vtol value.

But when I chnaged to strobeperiod of tran analysis to  1ns, abstime shows up at phase value of 10.002u.

I wonder why such descrpancy and why vtol  is NOT playing any role here.

Kind Regards,

 

 

Parents
  • Andrew Beckett

    My guess is that this might be something to do with now phase is defined. So can you show the rest of the code (at least the part that is setting the phase variable?).

    Also, what is ttol set to?

    And what version of spectre are you using?

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    My guess is that this might be something to do with now phase is defined. So can you show the rest of the code (at least the part that is setting the phase variable?).

    Also, what is ttol set to?

    And what version of spectre are you using?

    Regards,

    Andrew.

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