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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: Looking for serious reading material_I do know posted by Tony Lauck on March 18, 2014 at 12:19:43:
Were I a commercial DAC vendor, I would implement an NCO if my main jitter related concern were the rejection of transferred jitter, over having the absolutly lowest intrinsic phase noise local oscillator. This is simply because an NCO can be very closely 'tuned' to track the remote clock source's frequency over a very wide range. Sort of like an VCXO, but with an impossibly wide pulling range.Interestingly, Naim appears to have been seeking both the lowest intrinsic and the lowest transferred jitter when they designed their DAC. So, instead of a pullable VCXO, or a programmable NCO, Naim utilizes a series of individual XOs that are tuned to slightly different frequencies. One of these XOs will likely be close enough to the source clock's frequency, and so can be dynamically selected to serve as the local oscillator. Of course, there are practical limits to how many individual XOs are available. At some point, there won't be an close enough frequency match available, whereas an single NCO can be tuned to closely match a great range of remote source clock frequencies.
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Ken Newton
Edits: 03/19/14 03/19/14 03/19/14 03/19/14 03/19/14 03/19/14 03/19/14
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Follow Ups
- RE: Looking for serious reading material_I do know - knewton 05:27:14 03/19/14 (1)
- RE: Looking for serious reading material_I do know - Tony Lauck 06:14:29 03/19/14 (0)
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