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MC in cadence

RAO VINAY

Hi all,

I am new to monte carlo analysis features and I am unable to interpret results from that simulation in cadence. I have designed band-gap current reference and I want to know how the resultant current varies with process and mismatch. I have a set-up and had few runs. For some runs, it generates Gaussian distribution but for some other runs it generates only a single bin in histogram where all the samples are in one particular range. I am having few following doubts about MC analysis.

1> How do we go about MC analysis? Whether we have to start from some definite seed, where we have to do some trial and error and find out which seed gives the best? I think in my case, it may be generating all those samples which are very close, so all the samples' response is concentrated in one point.

2> What is child analysis? Whether every general analysis such as DC, AC, Tran, SP etc. are called child analysis?

3> How samples are taken when I have a selected child analysis. Ex: When I am varying temperature from -10 to 100 Deg C, each other samples are considered at which temperature? It is important because response is a scalar quantity and don't know those responses are w.r.t which temperature value.

4>How to plot or record responses for AC, Tran, SP etc for different samples ? Ex: I want my resulted current to be plotted w.r.t temperature along the x-axis but for different MC samples.

Thanks and regards,

Vinay Rao.

Parents
  • BTW, the fact that you are getting no variation for some measurements may mean either that there is no sensitivity to the variation in that measurement, or that your expressions is incorrect - maybe it is referring to the nominal results. Hard to tell without seeing it.
Reply
  • BTW, the fact that you are getting no variation for some measurements may mean either that there is no sensitivity to the variation in that measurement, or that your expressions is incorrect - maybe it is referring to the nominal results. Hard to tell without seeing it.
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