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In Reply to: RE: Software induced jitter: how long is a piece of string? (Part 2) posted by Tony Lauck on July 5, 2009 at 11:31:12:
DAC as Master or Reclocking do give good results and do best at reducing random jitter (thereby improving the DAC's SNR).
At issue is data correlated jitter and periodic jitter (the worst kind). Signal quality and content from Transport has impact irrespective of where the XO is placed. Slider's explanation of how data (input to DAC chip) modulates the clock signal is an excellent example of data correlated jitter. Yes clock jitter when measured at DAC chip input may well be sub picosecond (e.g. Superclock 4) but jitter distortion is much higher (when measured at analogue outputs).
Why would one expect a clock signal to be totally immune from signals entering the DAC chip via its other pins (clocks, data and control)? Ground bounce caused by the data signal is real and measurable.
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Follow Ups
- Clock therapy in isolation is not a cure - cics 07:45:40 07/06/09 (1)
- RE: Clock therapy in isolation is not a cure - Tony Lauck 08:49:54 07/06/09 (0)
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