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Setting dynamic parmeter in pss analysis

Abhrarup

Hi,

I am running a pss (shooting) simulation to generate accurate delay values by measuring appropriate crossing events of input & output signal. I want extremely high accuracy in these delay values reported. I get what i want if i set the maxstep to 1ps in pss --> options --> misc form.

However this approach increases simulation time by 50 times. Another way could be to chose maxstep as dyanamic parameter and force it to be 1ps during input rise time-stamp and output rise time-stamp. This does reduces simulation time a lot. 

If i chose this in pss form under dyanamic parameter form , what the simulator does is that it applies these inputs only to tstab simulation and not the final pss analysis. This does not solve my problem since i extract delay values from pss-td database. 

Is there a way I can address this issue?

  • Rather than setting maxstep, set maxacfreq; maxstep is set during the shooting interval to place 5 points per period of maxacfreq. This the mechanism used to control spectral accuracy at high frequencies in the shooting interval and avoids you having to set maxstep (which also affects the initial transient, which probably isn't necessary).

    Regards,

    Andrew

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