Re: very accurate timer


martin griffith wrote:
On Thu, 12 Oct 2006 23:32:54 +0200, in sci.electronics.design
"fragget" <fragget@xxxxxxx> wrote:

Hello, this is my first post here so here it goes...

I'm looking for a highly accurate timer, I need one that could measure a time in nanoseconds

if possible. I figured this would not be impossible since the clockspeed of a modern

computer is 3 Ghz, which means measuring a time up to a third of a nanosecond would be

possible. However a nanosecond is also fine by me;P
I really hope someone can help me out here on how to get such a component or how to make one;)

Thanks in Advance;)

Dave


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Just waiting for Bill S to jump in with an ECL problem solver
answer....

ECL will get you a 500MHz clock. When I did it for real, we actually
used Gigabit Logic's GaAs and an 800MHz clock, then interpolated
between clock edges with analog ramps to get down to 10psec resolution
- the jitter on our clock was about 60psec so the 10psec was entirely
theoretical.

The version I designed a few years later using ECLinPS and a 500MHz
clock was to have used a 500MHz Vectron crystal oscillator with around
1psec of jitter.

John Larkin now sells stuff to do the job.

http://www.highlandtechnology.com/DSS/V660DS.html

--
Bill Sloman, Nijmegen

.

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