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RE: Data and Jitter

"A DAC that buffers locally and controls I/O asynchronously will be immune to jitter that originates in the PC."

But any residual jitter that gets past the buffer won't be removed without side effect. The jitter (timing errors) will be transformed to noise (amplitude errors). For if the resampling (triggered by the independent output clock) occurs on the rising or falling part of the waveform, jitter will cause the instance of the resampling to take place at a different location on the rising or falling slope (due to time shift from the jitter). And at the sloped portion of a jitter-shifted wave, the resampled amplitude will deviate from that of a non-jitter-shifted wave. Hence the amplitude error. And since the jitter varies in time-shift error, the output then varies in amplitude error. So the end result is fluctuating amplitude error, which is noise.


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