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https://designers-guide.org/forum/YaBB.pl Analog Verification >> Analog Functional Verification >> Question about Offset-Simulation of comparators https://designers-guide.org/forum/YaBB.pl?num=1290584745 Message started by mate on Nov 23rd, 2010, 11:45pm |
Title: Question about Offset-Simulation of comparators Post by mate on Nov 23rd, 2010, 11:45pm Hi all, i designed a latched comparator and performed a simulation like the one described in the paper 'A Methology for the Offset-simulation of comparators' http://www.designers-guide.org/Analysis/comparator.pdf from this website. No I have some questions: 1. During the post-analysis in Matlab (code is at the bottom of this post) one defines Code:
Why choose sigma = 2.5? At the end one defines Code:
This should be the sigma_offset. This value changes if I use another value than 2.5 within the find function. I'm now not sure why he took 2.5 sigma. 2. My result gives me a mu of 30mV and a sigma of 30mV (when calculated like described). Is this interpretation correct: My threshold is now: threshold_ideal+mu, but how do i interpret this sigma? 3. Does anyone know any material/website about how get sigma and mu from the polynomial coefficients? Thanks for your help! ----- complete code: Code:
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Title: Re: Question about Offset-Simulation of comparators Post by mate on Nov 24th, 2010, 1:57am Hi, i just want to add some of my results. i have used Code:
the results are: μ: 2.5m σ: 25m Is that σ value (25m) now my 3σ already or do i have to multiply that one with 3 to get 3σ (which would be 75m) :-? |
Title: Re: Question about Offset-Simulation of comparators Post by AnalogDE on Dec 18th, 2010, 8:38am 25mV is your one-sigma offset. You multiply by 3 to get your 3sigma or you can also read it off the graph. Mu is your systematic offset. |
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