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Date: | Sat, 22 Feb 97 9:40:34 EST |
Content-Type: | text/plain |
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Hello Tech Netters:
I had an Engineer ask me the following, and I do not have any idea
if this has been done or simulated before. If anyone has any input,
real or theory.....
He asks:
I am looking for information on pc/flex layouts where twisted pair
cables have been simulated in the artwork. The purpose of the twisted
pair is to reduce the radiated magnetic field. I am considering using
this approach for audio signals (150 Hz to 7.5 KHz). Below is a very
crude representation of the layout.
* x * x * x
* x x * * x x * * x
* * * * *
x * * x x * * x x *
x * x * x *
The * represents 1 trace (top layer) and the x represents the
2nd trace ( bottom layer). This concept needs to fit on a double
sided flex. Ideally the representation above needs to have the 90
degree corners replaced with curved lines. The pattern should be
symetrical on both layers.
An alternative rigid application could be
* o o o o x
* x * x * x * x * x
x x x x x
x * x * x * x * x *
x o o o o *
Where the o represents a via and the traces "twist" about each other.
Any info you can get on layout considerations and performance would
be appreciated.
'''
(O O)
============================oOO==(_)==OOo=========================
Jack Holm \_/ \_/
PC Design "System Weenie" / jah \ Phone (219) 487-6199
ITT Aerospace/Communications (_________) Fax (219) 487-6033
1919 W. Cook Road \ _ / E-Mail [log in to unmask]
Fort Wayne IN. 46801 \ / \ /
===============================(_)=(_)============================
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