Hi Be careful when you talk about jitter of any device, OCXO's included. There is always an implied bandwidth in the conversion of phase noise to jitter. If you extend the bandwidth down low enough (as in low audio) the jitter goes up quite a bit. In the case of audio, jitter at low frequencies just might be something to worry about.
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Attila Kinali Sent: Monday, May 07, 2012 12:19 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Oh dear On Mon, 7 May 2012 10:02:25 -0600 Tom Knox <[email protected]> wrote: > > Actually the numbers are quite real, play with the math, a small amount > of jitter in a DAC (X) can have a large difference (Y) when sampling a > complex wave form especially in the audiophile world where the sound of > 24bit dac 16,777,216 discrete levels is clearly superior to older > 16 bit dac 65,536 possible levels in 44.1 KHz to 192 KHz formats. Yes, i know that jitter is a pain when it comes to ADCs, but keep in mind that your audio ADC does have a jitter of a couple 100ps itself. If it's a high end ADC that is. The standard ADCs are usually in the ns range. For a normal 10MHz XO you measure the jitter in in the lower 10ps at most, a good one at lower than 1ps cycle-to-cycle. Of course, you have to keep the clock signal clean of any disturbance that might add modulations to it. But that's a matter of keeping the power supply clean and having the signal shielded. It's not an inherent property of an Rb to have low jitter. And as we all know from the recent hype on the FE-5860As and the following measurements, not all Rb's are low jitter. Attila Kinali -- Why does it take years to find the answers to the questions one should have asked long ago? _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
