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Cadence Calculator Function for the difference between the abscissa of the intersection of two curves

Hi,

I am running a dc simulation for Schmitt Trigger .

Its voltage transfer characteristic curve is shown in the following figure (the green curve V=Vout ).And the red curve(V=Vin) has a slope of 1 .

I would like to find the difference between the abscissa of the intersection of two curves, which represents the hysteresis width of the Schmidt trigger.

Then I want to do a Monte Carlo simulation of hysteresis width.

So far I have ymin(abs(v("/vout" ?result "dc")-v("/vin" ?result "dc"))) obviously.

However, ymin(abs(v("/vout" ?result "dc")-v("/vin" ?result "dc"))) is not equal to zero but a very small value .I think it has to do with step size.

Is there a calculator expression for what I want to do?

My virtuoso version is 6.17-64b.

Thanks

zzzzzzzzzw over 4 years ago

need help！
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ShawnLogan over 4 years ago in reply to zzzzzzzzzw

Dear zzzzzzzzzw,

zzzzzzzzzw said:
I would like to find the difference between the abscissa of the intersection of two curves, which represents the hysteresis width of the Schmidt trigger.

Did you happen to see the SKILL script that Mr. Andrew Beckett provided for creating a list from the waveform of the hysteresis transfer function? His response and his SKILL function is at URL:

https://community.cadence.com/cadence_technology_forums/f/custom-ic-skill/25049/how-to-calculate-hysteresis-using-ocean-skill-script

As noted in this post, taking the difference between like x-values of will provide a measure of the hysteresis width that might be used in a set of Monte-Carlo analyses.

I hope this is somewhat useful for you - or provides some insight at the least!

Shawn
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