Re: [SI-LIST] : Clean sheet of paper

About this list Date view Thread view Subject view Author view

From: Douglas C. Smith (doug@dsmith.org)
Date: Wed Dec 22 1999 - 19:50:54 PST

Hi Jon and All,

When you drive through a capacitor you are basically differentiating
the signal. The receivers will become more sensitive to noise. A small
noise pulse will be integrated into a signal. It would be more
difficult to distinguish a real signal from one due to, for instance,
ESD.

Doug

Jon Powell wrote:
>
> I saw an interesting paper at an IEEE conference (In Monterey, perhaps
> EMC?) a couple of years ago. The author conjectured that the problem
> people are having is that everything is dependent on charging a large
> capacitor (the TLINE) and we have to get away from this.
>
> His proposal. Make all drivers drive through a large series capacitor.
> So the only signal sent it a pulse (+ or -) and you re-integrate the
> signal at the receivers (through some simple logic he presented).
>
> A couple of good things:
> 1) You don't need low-resistive contacts for your pads. Just squares of
> metal that sit over top of each other and form the capacitors.
> 2) You don't have to worry about current content.
>
> Some bad things (that he didn't mention).
> 1) Crosstalk noise probably gets more critical.
> 2) Nothing is really "clocked" anymore (hey, maybe this goes in the good
> thing category).
>
> Once again, this is not my idea. (but I sort of like it).
>
> regards and Happy Hollidays.
> jon
>
> --
> Jon Powell
> Director of HSSD Consulting Services
> Viewlogic Systems, INC.
> 805 988 8250
>
> **** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP.
> si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list
> **** 

-- 
-----------------------------------------------------------
    ___          _           Doug Smith
     \          / )          P.O. Box 1457
      =========              Los Gatos, CA 95031-1457
   _ / \     / \ _           TEL/FAX: 408-356-4186/358-3799
 /  /\  \ ] /  /\  \         Mobile:  408-858-4528
|  q-----( )  |  o  |        Email:   doug@dsmith.org
 \ _ /    ]    \ _ /         Website: http://www.dsmith.org
-----------------------------------------------------------

**** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP.
si-list archives are accessible at  http://www.qsl.net/wb6tpu/si-list
****

About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Tue Feb 29 2000 - 11:39:13 PST