From: Dennis Tomlinson (email@example.com)
Date: Tue May 30 2000 - 14:21:16 PDT
It's not magic. It's the 3dB cutoff frequency
found in any filter or circuit theory text.
Validity, on the other hand, is another matter.
The "magical" Tr = 0.35/B applies only to signals
and systems which can be characterized as
low pass, and then only to those of first order.
As an approximation, it may also be applied to
multi-order systems whose characteristics are
dominated by a single low pass pole. I think we
see lots of the latter in SI work.
> Well done!
> Except ................
> What is magical about defining
> B = 1/(2*Pi*RC)
> as opposed to defining it any other way?
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