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Histogram from stddev function in calculator (Read 2357 times)

ic_engr

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Histogram from stddev function in calculator
Dec 01^st, 2008, 12:57pm

Hello All,

I have IC5141 version. I was able to get an estimate of the RMS jitter for a clock output by using the 'freq' function and inverting it. I then used the 'stddev' in calculator on '1/freq' to obtain the standard deviation which provides me the RMS jitter for the signal of interest.

What I also want is to generate the histogram of the result from 'stddev' result. I do not see any 'histo' function in the calculator.

Any suggestions would be appreciated. I do see the 'freq' has the histogram capability, but that's a histogram of frequency. I need the histogram of the variance of the periods.

So how can I get the histogram of stddev(1/freq(/VT)).?

ic_engr

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Andrew Beckett

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Re: Histogram from stddev function in calculator
Reply #1 - Jan 4^th, 2009, 4:44am

I assume you don't really want a histogram of the standard deviation, but instead a histogram of the period variation?

In IC613, there's the "histo" calculator function. So you can calculate the freq (versus cycle, say), and then invert it, and then use the histo function (you specify the number of bins, and min and max values, and the result is a histogram as you want).

Can you use IC613? You could just run "viva" standalone and look at your existing simulation results.

Best Regards,

Andrew.

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