Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics.

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It Does Not Really "Improve" Jitter.....

Posted by Todd Krieger (A) on November 24, 2005 at 23:41:14

In Reply to: How could a digital IC improve jitter? posted by mr grits on November 21, 2005 at 12:11:29:

A good digital cable does not reduce jitter.... It just does not increase jitter.... Ideally the cable will not make the jitter demonstrably worse than that of the transport itself.

A digital cable has two properties that can contribute to increased jitter- Bandwidth and (if it's electrical, not optical) characteristic impedance.

If the digital cable's bandwidth is insufficient, the digital data's "leading and falling edges" become "rounded"... Like a square wave with poor rise time.... Take those rounded pulses, and in the presence of noise, the "timing" of the data triggering at the DAC's input becomes varied, causing jitter. With a wide-bandwidth cable, the "leading and falling edges" are "steeper" or more-vertical, and noise varies the timing less, minimizing jitter to that of the transport.

If an electrical RF cable has a characteristic impedance that deviates from the ideal 75 (or 110) ohms, signal "reflections" occur at the terminations. These reflections can induce amplitude and timing variations in the signal that can also increase jitter.

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