Virtuoso, monte carlo simulation to measure fervency of ring oscillator

Amin,

This doesn't make sense. Using the freq function in the calculator has nothing to do with the success or otherwise of the simulation. So it's unclear what your real problem.

Regards,

Andrew.

Hi Andrew

I need to measure the frequency of ring oscillator in dc sweep simulation   ( frequency vs vol)

thanks

Hi Andrew

I need to measure the frequency of ring oscillator in dc sweep simulation   ( frequency vs vol)

thanks

Amin Zayed said:

I need to measure the frequency of ring oscillator in dc sweep simulation   ( frequency vs vol)

Well, that's very simple. You can't. Since a DC analysis is not time-varying, your oscillator will not oscillate and hence there will be no frequency to measure.

Andrew.

Hi Andrew

I need to make PUF (Physical Uncolnable Function ) and test it using monte carlo analysis 

so, i need to measure the frequency of ring oscillator vs the temperature variations .

Many thanks  

Hi Amin,

I assume you mean a Physically Unclonable Function (unless Uncolnable is some term I've never heard of) - not that this is terribly relevant to the question. I still don't understand why you think a DC sweep is suitable to measure the frequency of a ring oscillator.

Normally you'd use either a transient simulation and then take the average frequency over a range of time after the oscillator has started, or better still use PSS oscillator mode and then use the expression on the direct plot form to find the frequency (this will find the steady state frequency). You could then run this in Monte Carlo in ADE XL, Explorer or Assembler, to get the variation of the frequency. If you want to see how that variation varies with temperature (and how the mean frequency varies with temperature), then you could sweep temperature as part of a corner (in ADE XL, Explorer or Assembler), or by sweeping the variable "temperature" in ADE Explorer or Assembler (in ADE XL you can't do a variable sweep at the same time as Monte Carlo, unless you do it within the corner definition).

Please do read the forum guidelines. You'll find if you ask a well-formed question, in the right forum (I doubt you're really asking about the SKILL language), with enough information about what you're trying to do, what you've tried, and which tools and versions of the software you're using, then you're much more likely to get a focussed answer. Because you didn't provide any of this, anyone (including me) answering here has to guess what you really want...

Regards,

Andrew.