[SI-LIST] Re: Discontinuities on PCB

  • From: "Mark Burford" <Mark_Burford@xxxxxxxxxxx>
  • To: <ch_harrington@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 12 May 2005 11:49:37 +0100

Suggest you start with Eric Bogatin's book 'Signal Integrity Made Easy'
like I did (also a post graduate) then save the questions you have after
reading the book for these guru's of the signal integrity world.  It is
an excellent book and a good read also.

Anyone else go to the Cadence seminar Tuesday that I didn't get to meet?

I was the younger looking of you 'seasoned' experts!! ;o)

Hope this helps
Mark

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Charles Harrington
Sent: 12 May 2005 11:36
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Discontinuities on PCB

Hello,

When a TEM (or quasi-TEM) signal propagating on a
microstrip trace meets a discontinuity (e.g., a via)
on a substrate at microwave frequencies, higher-order
modes are excited at the discontinuity, leading to
reflections.

Can anyone tell me exactly what kind of modes are
excited and why they are excited. How far away from
the discontinuity can they propagate and how does this
depend on the operating frequency.

I'm a postgraduate student currently working on=20
discontinuities on PCB. My search for relevant
literature led me to this list. So, I'll appreciate
any
help.=20

Charles.


        =09
Yahoo! Mail
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