In Reply to: RE: How can USB performance impact audio quality? posted by Tony Lauck on June 12, 2011 at 20:53:24:
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
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: How can USB performance impact audio quality? - audioengr 11:17:26 06/13/11 (6)
- A few things... - Gordon Rankin 14:00:44 06/13/11 (3)
- RE: A few things... - Tony Lauck 09:48:05 06/16/11 (0)
- RE: A few things...you are right - fmak 07:16:08 06/16/11 (0)
- A few more things... - audioengr 10:26:29 06/14/11 (0)
- RE: How can USB performance impact audio quality? - Tony Lauck 12:31:04 06/13/11 (1)
- RE: How can USB performance impact audio quality? - audioengr 10:33:11 06/14/11 (0)