RE: [SI-LIST] : RF experience VS SI issues

Charles Hill ([email protected])
Mon, 24 Nov 1997 21:24:00 -0700


I'm certain there are many among us who have RF circuit experience. I =
would say that it helps indirectly in solving SI issues since most RF =
design is small signal and in the frequency domain, and most SI =
(digital, that is) is large signal and in the time domain. =
Nevertheless, the underlying physics is the same. In applying the =
physics to problem solving, useful design concepts arise. Since there =
are differences between SI and RF design, there are separate, but =
related, design concepts. The first step is to understand the phenomena =
in question and analogies with RF design are useful as are empirical =
data, history of design practices, and anecdotal evidence. But the =
second step, the harder step, is to quantify a phenomenon, and that =
requires careful measurement or a thorough simulation, and a solid =
theoretical foundation. As one can tell by reading the SI list, there =
are differing views on the importance, applicability, and interpretation =
of most design concepts.=20

Charles Hill, consultant
[email protected]=20

From: Weber Chuang[SMTP:[email protected]]
Sent: Friday, November 21, 1997 7:31 PM
To: '[email protected]'
Subject: [SI-LIST] : RF experience VS SI issues

Dear SI engineers,

Does any one among you have any RF circuit experience? Does it help
directly while you are trying to solve SI issues and designing digital
CMOS circuit(especially I/O cells)? How closely correlated are the RF
concept and SI issues, only the transmission line theory? In RF, the
phaseshift and diversifying groupdelay and VSWR ...etc that caused by
the PCB trace is often mentioned, can these be also applied to SI issues
in digital world? If yes, how? If no , why? I would like to hear your

SI Engineer. VIA Tech.