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Hello All,
Presently, I've not found yet any IC that performs=20
LVDS to LVPECL conversion. Just need one pair=20
converted.=20
My current strategy is to use the following passive method:
(50 ohm system; the following applies to each=20
line in the LVDS diff. pair)
short segment with :
10pF in series then a VBB bias of 680ohm pullup to 3.3v=20
and 1Kohm pulldown to VEE(gnd).
schematically:
LVDS input----cap---bias---LVPECL diff. driver for fanout on pcb=20
Q1: Seem ok (provided all the other SI rules followed)?=20
Q2: Is use of a ferrite bead between pullup and/or pulldown=20
resistor and its plane, to filter out noise at the VBB=20
bias point, a good idea or just overkill?
Thanks,
John Lipsius
MTS
Cyras Systems, Inc.
510-623-6631
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