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Clean Clocks, Once and for All?

Network-based digital audio interfaces are becoming increasingly popular. But they do pose a significant jitter problem wherever high-quality conversion to/from analog is required. This is true even with networks such as 1394 that provide dedicated support for isochronous flows. Conventional PLL solutions have too-little jitter attenuation, too-much intrinsic jitter, and/or too-narrow a frequency range. More-advanced solutions tend to have too-high a cost. We present a new clocking technology that boasts high performance and low cost. It has been implemented in a recent audio-over-1394 chip. We show comparative performance results and explore system-level implications, including for systems that use point-to-point links such as AES3, SPDIF and ADAT.

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