Re: history of the DDG

On Sat, 12 Jul 2008 16:35:41 -0700 (PDT), bill.sloman@xxxxxxxx wrote:

On Jul 13, 7:43 am, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi,

I'm writing a paper on the history and theory of Digital Delay
Generators. So far, the HP 5359A seems to be the first "modern
architecture" DDG I know of. HP did another, possible older, unit
based on a triggered crystal oscillator, if you can imagine such a
thing.

Does anybody have any idea of who did the first DDGs? There's a good
chance it was in some physics lab, maybe written up in one of the
physics journals.

I know that BNC and LeCroy did DDGs in the 1970's sort of time frame.

Physicists were into this kind of stuff fairly early on. The Wilkinson
time-interval digitiser is pretty old.

http://herkules.oulu.fi/isbn951427461X/isbn951427461X.pdf

That's a TDC, not a DDG. And he somehow neglected to mention my
technique.


may give you a look into that literature.

http://www.iop.org/EJ/abstract/0957-0233/10/3/019/

might include a decent review of the literature, which is to say it
would have done if I'd refereed the article. You could buy it for
around $30 or get a friendly academic to download it for you.

That one looks like a specific, recent application. I'm more
interested in ancient history.

It's downright unscientific that scientific papers are only available
for sizable chunks of cash, and that a few companies monopolize that
trade. It takes money to, usually, find out the the paper is mostly
worthless.

John

.

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