RE: [SI-LIST] : MECL System Design Handbook

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From: Michael Nudelman ([email protected])
Date: Thu May 10 2001 - 10:52:12 PDT

Well, I can tell what one of the issues is:

Our PCB designers (we use Veribest) spent bundles of time trying to benignly
bend about few hundred BS-coupled diff-pairs. And it doesn't always work
well - I saw bunch of cases where the auto-bent will work different on
different layers.

Especially where bending radius is small. It could account of day-two with
kinda'boards we make.

-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Thursday, May 10, 2001 1:46 PM
To: Michael Nudelman
Cc: [email protected]
Subject: RE: [SI-LIST] : MECL System Design Handbook


Right angle bends are:

A very high frequency, essentially microwave, effect. Provided you have low
voltages. Part of the concern is a legacy of higher voltages associated with
discrete BJTs, and before that, vacume tube RF circuits.

But, I understand chamfered or radius bends give better fab yields. So,
the real issue other than refining a rule of thumb?



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