Re: [neonixie-l] Re: How ICs are made - the inside track...

Thu, 26 Jan 2017 13:26:33 -0800

I had a very similar issue here in my lab recently while checking out an HP X-Y display. I was feeding both x and y the same signal in order to check out the phase spec between both ch. at 20 MHZ. Unfortunately idiot here had used two different length cables to feed x and Y, and then sat there trying to figure out why it would NOT meet spec. It finally dawned on me. Two equal length cables solved the issue. Ira. 

On 1/26/2017 12:45 PM, chuck richards wrote:

Yep, there's that part of it to consider as a portion
of the total overall result.

But, check it out, do the math.  The speed of light
is roughly one nanosecond per foot.

Yes, yes, electricity "flows" through a wire some tiny bit
slower than that, but the above approximation gets it well
within decent enough accuracy to aid a person in "seeing" what
is happening.

One time at Verizon we had a timing issue due to combining both 50
foot and 100 foot clock cables to different processor complexes
in a GTD-5 electronic telephone exchange.  That clock runs at 12.352
mHz.

I pointed out that the clock pulses were arriving at the end of the
100 foot cable about 50 nS later than those pulses arriving at the
end of the 50 foot cable.  That indeed was the problem.

We swapped out the 50 footers and made them all 100 footers, and
that cleared the trouble.

Chuck



---- Original Message ----
From: [email protected]
To: [email protected]
Subject: Re: [neonixie-l] Re: How ICs are made - the inside track...
Date: Thu, 26 Jan 2017 12:14:09 -0700


What I find particulary amusing is that the drift velocity of the
actual
electrons is of the order of a cm/s if I remember correctly. Jens

On 1/26/2017 11:07 AM, chuck richards wrote:

Yes, that is correct!  Because electricity travels
through a wire at the approximate speed of 1 nanosecond per foot!

Chuck

---- Original Message ----
From: [email protected]
To: [email protected]
Subject: Re: [neonixie-l] Re: How ICs are made - the inside

track...

Date: Wed, 25 Jan 2017 21:28:47 -0500


On 17-01-24 03:14 AM, Roddy Scott wrote:
Processor chips

may have gotten a little bit bigger but not by much but could you
imagine the size of a computer based on the ENIAC
<https://en.wikipedia.org/wiki/ENIAC> technology and the power
requirements? The original consumed 150KW and weighed about 30

tons, a

modern day version would need its own power station and would

take

up a

football stadium

Ah but you are forgetting as Admiral Hopper liked to point out,

the

size
of a nanosecond.  A football stadium sized computer could not get

out

of
it's own way.

--
Charles MacDonald                 Stittsville Ontario
[email protected]              Just Beyond the Fringe
No Microsoft Products were used in sending this e-mail.

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