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Music servers and other computer based digital audio technologies.

RE: How can USB performance impact audio quality?

Tony - how many of these clocks and USB interfaces have you designed?

I am evaluating an expensive NEL OCXO with really low jitter specs. Driven from a really high quality regulator, it still has 80-100psec of P-P jitter as measured by my 7GHz Tek scope. It is unrealistic to expect to get 1psec of jitter from any system IMO, much less a clock. It is difficult to achieve speced jitter on a clock in an actual system.

Isolation stages all add jitter BTW, and are useful only in the non-jitter sensitive paths. The only way to keep the jitter really low is to keep the design extremely simple with ultra-short paths.

Individual regulators, and high-quality ones certainly help. I use 7 in my USB converter.

Steve N.



Edits: 06/13/11

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