🚀 go-pugleaf

On 01/11/2012 01:43 PM, John Larkin wrote:
> On Tue, 10 Jan 2012 18:02:50 -0800 (PST), Bill Sloman
> <bill.sloman@gmail.com>  wrote:
>
>> On Jan 10, 4:55 pm, John Devereux<j...@devereux.me.uk>  wrote:
>>> Robert Macy<robert.a.m...@gmail.com>  writes:
>>>> On Jan 10, 2:28 am,BillSloman<bill.slo...@ieee.org>  wrote:
>>>>> On Jan 10, 7:47 am, "David L. Jones"<altz...@gmail.com>  wrote:
>>>
>>>>>> Just thought some might be interested in hearing our recent guest on
>>>>>> our Amp Hour radio show, Dr Howard Johnson of "Handbook of Black
>>>>>> Magic" fame:http://www.theamphour.com/2012/01/10/the-amp-hour-77-winsome-waveform...
>>>
>>>>>> Lots of history of the book, signal integrity, Gigabit Ethernet
>>>>>> development, 90 degree PCB bends, audiophoolery, and a whole bunch of
>>>>>> other talk over almost 1 1/12 hours.
>>>
>>>>> "Black Magic" is more notorious than famous. I own both it and it's
>>>>> follow-up, and both have got some useful content but they are badly
>>>>> organised and what useful content they do contain is hard to find.
>>>
>>>>> The field is still waiting for a decent textbook on high speed circuit
>>>>> design and layout.
>>>
>>>>> This is one of the few matters on which John Larkin and I seem to
>>>>> agree.
>>>
>>>>> --
>>>>> BillSloman, Nijmegen
>>>
>>>> Perhaps, it is time for the first ever 'conference' book written by a
>>>> consortium of engineers/scientists.
>>>
>>>> Put my name in for proffreading.  :)
>>>
>>> Great idea. Perhaps John Larkin, Jim Thompson and Bill Sloman could
>>> collaborate on it.
>>>
>>> Sure that will work out well... :)
>>
>> I'm not sure what Jim Thompson might contribute. I've seen papers that
>> worry about the characteristic impedance of connections on the silicon
>> (or whatever) inside integrated circuits, but I don't have the feeling
>> that Jim designs stuff that's big enough and fast enough for him to
>> need to know much about it.
>
> I get the impression that most interconnects inside ICs are primarily
> distributed R-C things, not real transmission lines at all.
> Propagation speed of interconnects is a big deal in routing fast logic
> chips, but the speed of light isn't the issue.
>
>>
>> Motorola's ECL applications notes on board layout were rather useful,
>
> Just don't trust their microstrip equation!
>
> John
>

Yup, all RC transmission lines with repeaters, speed roughly c/10.

Cheers

Phil Hobbs

-- 
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net