[SI-LIST] Re: Right Angle Bends
- From: "Stefan Milnor" <stefan.milnor@xxxxxxxxxxxxxx>
- To: "Michael Greim" <mgreim001@xxxxxxxxx>, "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- Date: Sat, 16 Jul 2011 08:29:45 -0700
There were plenty of signal integrity issues in the days of DIPs and
wire wrap. The structures were just bigger. One of my favorite signal
integrity references is the Motorola ECL (Emitter Coupled Logic)
Handbook, long out - of -print. It is amazing what they did in the '60s
with high speed ECL wire-wrap constructions. And everything that you
have been debating can be analyzed and explained with a set of equations
developed in 1862 .....
- Stefan
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Michael Greim
Sent: Saturday, July 16, 2011 5:13 AM
To: Lee Ritchey
Cc: Scott McMorrow; Julian Ferry; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Right Angle Bends
Regarding "myths" and SI, Folks look everywhere and believe
what they "think" is there, and other folks may very well go, yup
it's there. However, they only really "see", when the light is good.
After all, if someone posted something on the SI list, then by
definition
it has to be true because only "the experts" on any given topic post
there.
Unless of course, they are a manager.........;-) or mangler as some
may view it, on items of a technical nature.......8-P......when the
light is good.......8-O.
Everyone knows that if you can't see it then it is not there, much like
the emperors new clothes. Lab correlation and validation will verify
the lack of clothing. Ya myt could sim this as well.
In the days of DIPs there was no need for any signal or power integrity
and a twisted pair was merely two wire wrap wires put into a drill and
the trigger being pulled, and wirewrap established the ideal spiral
serpentining for signal transmission.
That is all............
Best Regards,
Michael C. Greim
And all this science they don't understand
Is just my job six days a week.....
We will either find a way or make one -Hannibal
In the middle of every difficulty lies opportunity -Al Einstein
On Fri, Jul 15, 2011 at 6:47 PM, Lee Ritchey
<leeritchey@xxxxxxxxxxxxx>wrote:
> It is odd that those who fret over right angle bends seem to ignore
the
> fact
> that there is at least on at every via where a trace connects. My old
> friend, Dan Murphy, called this "looking where the light is good."
>
> The same engineers used dual in line IC packages by the millions with
as
> many as three right angle bends in each lead. They weren't visible,
so
> they
> didn't count!
>
> --
>
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