[sdiy] Relative merits of various BBD's

[Tom Arnold]

On Sat, Jan 22, 2005 at 09:48:54AM -0800, Scott Stites wrote:
> It is not uncommon to find commercial designs that toss the max clock freq
> aside and go for the gusto, often with very good results.
> 
> The only one now that I can think of offhand is the hugely successful Blacet
> Time Machine, which I believe is based off of the MN3005, a 4096 stage
> device.  Max clock freq of the MN3005 is 200 kHz, minimum delay of the Time
> Machine is 2 ms.

I'll just point out that one reason the Time Machine dissappears isnt due to
lack of MN3005's but lack of MN3005's that will handle a reasonable clock
because they are run close to max rated speed and dont do it well...  I
think a look back at Mr Blacet's emails will provide ample evidence to back
that up.

Some of the high-end Reticons would go well up into mhz range.  And there's
a company in Texas I think that still makes "precision" BBDs ( now there's a
word pair you dont see normally ) that will go to insane frequencys, at a
price...  

Of course for short delays where you only need 32 or 64 stages, its easy
enough to just build a discrete BBD, just boring to stuff the board.

-- 
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 - Tom Arnold -       When I was small, I was in love,                  - 
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