# Re: [SI-LIST] : Calculate clearance between conductors per frequency/fall time.

From: Neeraj Pendse ([email protected])
Date: Wed May 16 2001 - 13:44:20 PDT

Chris,
I wonder what you mean ... are you talking about simple trace-loops
(no plane) or microstrip or stripline? If you are using a lumped
element approximation (if you can make that approximation based upon
your edge rates/legths), then there is only a week dependance between
mutual inductance and frequency. Frequency will show itself up in the
developed voltage, though per the formula v = jwM. Now if you have M
as a function of clearance M = M(d) , you can always decide what
induced voltage maximum you can tolerate, fix it at v = Vmax and get a
formula:
Vmax = j * 2 * pi * f * M(d) from which you can easily calculate
clearance requirements.
I did not do it, but I am sure same concept applies if you are using a
transmission line model.
Hope this helps!
- Neeraj Pendse.
National Semiconductor Corporation
http://www.national.com NYSE: NSM

Original Message dated 5/16/01, 9:42:32 AM
Author: "Chris Robertson" <[email protected]>
Re: [SI-LIST] : Calculate clearance between conductors per
frequency/fall time.:

Has anyone got a good way to Calculate clearance between conductors
per frequency/fall time?

I would like to document some results or formula for calculating this.
(non-impedance controlled)

Chris Robertson
Chris.Robertson[email protected]

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