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How to tell PSS to ignore a vpulse source

Dear All,

I am doing a PSS/PSP analysis. I am using a vpulse at the supply node. This vpulse is meant for generating a supply step input The step starts at 2us and then sets at the supply voltage in the rest of the simulation time.

I have set the period of this source very large (T=1ms).

I have other vpulse sources which generates the periodic clocks (T=0.4ns).

But PSS is also considering the supply- Vpulse and setting the beat frequency 1K.

Is there any way of telling PSS to ignore the supply- Vpulse and set the beat frequency as per the clock-Vpulse ?

I am also trying with setting the beat period manually ie. 0.4ns. Is this the right way ?

Kind Regards,

Andrew Beckett over 11 years ago

If you omit the period of the pulse source, it becomes a one-shot and will not affect the beat period. Even setting the beat period manually won't work if the period is set, because spectre will check that the sources are consistent with the beat period.
Omitting the period of the source is the right solution to this.
Andrew.
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Andrew Beckett over 11 years ago

In case that wasn't clear, what I mean is on the source itself, leave the period blank.
Andrew.
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