4 Nov
2011
4 Nov
'11
7:23 p.m.
Chuck Guzis wrote:
Without someone the stature of Bob Pease to back me
up, I'll stick my
foot into this thread at the expense of losing it by saying I've seen
very few digital designs that could compete with a well adjusted
analog PLL data separator and associated filters.
With regard to data separators for reading magnetic media in real time,
I would agree with you. However, for archiving legacy magnetic media, a
DPLL in software has the potential to be far better than any analog PLL,
precisely because it is effectively possible to throw an arbitrary
amount of computation at it.
On the other hand, a naive implementation of a DPLL data separator will
certainly have worse performance than a good analog PLL.