Hi to sll signal integrity experts. I am just a little rusty on "probability and random variables". Lets say that I had a system with two or more elements that generated Gaussian distribution or, random jitter, or random jitter. Random jitter tends to be specifed in terms of the standard deviation of the distribution. Each generator would therefore have a "sigma", which is also an RMS value. If I knew the sigma of each of the distributions coming from the generators, then I could convert these sigma values to a peak to peak number by arbitrarily assigning a desired bit error rate. The peak to peak values, as far as I know, will add, linearly. However, if I wanted to stay in the statistical world, how could I add the two sigma values for the two jitter generators? In my way of thinking, they can not add linearly (sigma 1 plus sigma 2). Is this wrong? Thank You Tom ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu