05-10-2011 12:38 PM - edited 05-10-2011 12:52 PM
I usually try to lead Faisal along a path to understand certain principles of logic design and sampling theory and measurement techniques and... [whatever the need of the moment might be]. After 20 or 30 posts, I usually give up on any pretenses of socratic method for professorial instruction, and I simply spell out what needs to be done -- leaving the explanations for later. Faisal, I think, usually picks up on the concepts at hand (memo to myself, the less you write, the more Faisal learns).
This is to be expected. I'm not sure if English is Faisal's native language (even if he is living in the UK), and I'm very sure that 'nerd English' is not Faisal's native language. The subject matters of Faisal's threads do not lend themselves gracefully to forum post discussion. Interactive discussion would be much more productive.
Having said all this, this thread has gone on long enough. Here are my suggestions, and we'll let the underlying theory follow behind on its own schedule.
You are trying to measure the rate of drift between two timebases. Here is how to do this.
Rate of Drift from 0 to 10nS
Rate of Drift from 0 to 20nS
Rate of Drift from 0 to 40nS
-- Bob Elkind
05-11-2011 12:24 AM
you ask why am I particular,
its because the fundamentals are essential, and you have implied on a number of occassions that you have tow board with exactly 100 MHz on them, apart from drift.
where as this is not true,
you have two boards with 100 Mhz on them +- 0.5 ppm.
hence they are VERY unlikely to have the same frequency.
even if you have two rubian clocks , they do NOT produce the same frequency,
the atomic clocks around the world are averaged to achiev UTC.
if you put scope porbes on the ref clock output of two atomic clocks, you do get a beet frequency which is the differsance in frequency between them. OK it s small , VERY small, but it is there.
this is what I am hoping you can expalin,
but I'll leave you to the forum now,
have a good synth.
05-11-2011 04:06 AM - edited 05-11-2011 05:28 AM
Many Thanks and Sorry for disturbing your patience.
I'm not sure if English is Faisal's native language (even if he is living in the UK), and I'm very sure that 'nerd English' is not Faisal's native language.
Yes , I am not a native speaker of english and I heared language is not a barrier. In my case it does not work .
Time response of my brain is too slow to catch up. Also I haven't studied any digital design as part of my course rather than basic digital electronics. This is one of the reason why I have encounterd all difficulties in the journey of embedded design.
Cultural and traditional difference also matters in dealing with nerd's like you,supervisor e.t.c. I should change.
Many thanks for your support right from the begining.