[SI-LIST] : Frequency based on rise time for drivers

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From: richard hill (richard2636@excite.com)
Date: Thu May 24 2001 - 10:32:20 PDT


I have often seen people estimating the frequency of a
driver based on the rise time for the driver using the
formula Freq = .35/Tr (This seems to be true for a
perfect sinusoid). There can be two different
drivers outputing signal at the same frequency but
different edge rates, won't this assumption be
invalid. Some times there is a big difference in the
edge rates of drivers running at the same frequency.
If we use the above formula and estimate the edge rates
using the frequency for the two drivers we will get
similar no.s.

Any comments.

Thanks in advance,
Rich

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