17 Feb
2009
17 Feb
'09
2:27 p.m.
On Tuesday 17 February 2009 01:45:05 Fons Adriaensen wrote:
On Tue, Feb 17, 2009 at 08:13:02AM +0100, Arnold
Krille wrote:
Thanks for all the advice and help on this issue folks. I really appreciate
it!
--
Bearcat M. Şandor
Bearcat(a)feline-soul.net
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But not only do they sync up to four
AD-converters to get one channel
with 4GS/s (current state of the art is 8GS/s!), they also sync several
of these devices to act as one digital oscilloscope with multiple
channels. They do the syncing by 10MHz clock and somehow manage to
distribute the trigger event to all devices involved. Quite spooky and
lot of hf to deal with.
Yep, 10 MHz is the standard for reference frequency
distribution for lab instruments. Getting decent GHz
clocks from that requires careful PLL design.
Returning to the original matter: multiplexing AD/DA
do exist of course, and they are the best solution
if you require lots of low bandwidth channels.
One reason you won't find many of them in pro audio
is the channel isolation requirement (> 100 dB)
- it would be very hard to make a fast analog
multiplexer reaching anything near that figure.
Ciao,