Here's some stuff from my little library. I heard the last paper at
DesignCon98 and thought it was really good.
"MECL System Design Handbook," Blood, Motorola #HB205.
"Transmission Line Effects in PCB Applications," Motorola Application
Note AN1051. (To order, check out their web page.)
"High-Speed Digital Design," Johnson and Graham, PTR Prentice Hall,
"Network Topology Analysis Using the Reflection Coefficient," John
Grebenkemper (Tandem), presented at DesignCon98. (For proceedings, see
www.designcon.com and pull down the "List of Contents" menu.)
Greg Edlund, Principal Engineer
Server Product Development
Digital Equipment Corp.
129 Parker St. PKO3-1/20C
Maynard, MA 01754
(978) 493-4157 voice
(978) 493-0941 FAX
From: Bodley, Andrew[SMTP:firstname.lastname@example.org]
Sent: Tuesday, March 03, 1998 11:50 AM
Subject: [SI-LIST] : transmission line theory
I am interested in transmission line theory as suggested
below. Does anyone have suggested references both basic and
> I find it necessary to go back to transmission
>line theory (reflection coefficients, etc.) and make
>simulating makes sense!
> -----Original Message-----
> From: Greg Edlund [SMTP:Greg.Edlund@digital.com]
> Sent: Tuesday, March 03, 1998 5:06 AM
> To: 'Mark Nass'
> Cc: 'email@example.com'
> Subject: RE: [SI-LIST] : Driver Strength
> I have found that driver current ratings don't mean a whole
> They are a hold-over from TTL days, when each receiver drew a
> current and a driver had to be able to source the dc current
> loads. In a CMOS environment, they are useful in a relative
> you can guess that a 4 mA driver will probably have a lower
> impedance than a 2 mA driver - within the same part family and
> vendor. However, don't expect vendor A's 4 mA driver to have
> output impedance as vendor B's 4 mA driver.
> Output impedance tends to be a much more useful parameter in a
> transmission line environment. Unfortunately, most vendors
> output impedance. If you have a non-linear output IV curve,
> vary over loading, making it a little difficult to spec. The
> would have to guess what kind of environment driver will see
> say, a 60 Ohm resistive load to ground and Vdd. Even this
> is more useful than nothing.
> The best thing you can do is to ask for an IBIS model of your
> that is verified against lab data.
> How many loads you can expect to drive varies widely with load
> capacitance, net topology, and timing. A behavioral simulator
> excellent tool for prototyping nets and answering these kinds
> questions. It's important not to rely on the simulator to do
> work for you, though. I find it necessary to go back to
> line theory (reflection coefficients, etc.) and make sure what
> simulating makes sense!
> Greg Edlund, Principal Engineer
> Server Product Development
> Digital Equipment Corp.
> 129 Parker St. PKO3-1/20C
> Maynard, MA 01754
> (978) 493-4157 voice
> (978) 493-0941 FAX
> From: Mark Nass[SMTP:firstname.lastname@example.org]
> Sent: Monday, March 02, 1998 10:35 PM
> To: si-list@silab.Eng.Sun.COM
> Subject: [SI-LIST] : Driver Strength
> Can someone explain to me what driver strength means?
> a driver is spec'd by an ASIC vendor as a 12ma, 6ma, etc
> that mean as far as its expected VI curve and how many
> I can expect it to drive?
> Mark Nass