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https://designers-guide.org/forum/YaBB.pl Measurements >> Phase Noise and Jitter Measurements >> measuring Jee, Jcc, Jper https://designers-guide.org/forum/YaBB.pl?num=1280895156 Message started by casual on Aug 3rd, 2010, 9:12pm |
Title: measuring Jee, Jcc, Jper Post by casual on Aug 3rd, 2010, 9:12pm Referring to designers-guide document, the 3 main types of jitter are edge2edge jitter Jee, Period jitter Jper and cycle2cycle jitter Jcc. 1) When we plot eye-diagram of a clock and find the histogram across its threshold voltage of the clk, then the jitter we obtain is the edge2edge jitter Jee. Jee is a high freq jitter. 2) Cycle2cycle jitter Jcc can be obtained by: delta of 1/(clkfreq_continuous) (1 / (freq (VT("/clk") - VT("/clkb")) "rising" ?mode "user" ?threshold 0 ?xName "time" ?histoDisplay nil ?noOfHistoBins 1)) 3) Jper (accumulated jitter, long term jitter) can be obtained by post-processing -->accumulated_clk_period - accumulated_idealclk_period note: The values above are not RMS but absolute values Am I correct? |
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