[SI-LIST] High Frequency/High Speed ...
- From: "Doug McKean" <dmckean@xxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 8 Aug 2001 16:45:18 -0700
I'd break them out as analog and digital.
A high frequency signal I'm interpreting as
more of a single frequency being analog.
A high speed signal meaning some sort of high
speed throughput, i.e. data rate, being digital.
In terms of signal integrity, frequencies of both
surely come into play. But, the high speed signal
might have an exceedingly fast edge rate which
puts concerns far above the fundamental. And
that in turn brings in the concept of bandwidth
which may have more of an impact than with
a single frequency.
To put it another way, say you're designing 2 boards,
one for a 1 GHz analog signal, the other for a 1 GHz
data signal. The bandwidth of the final board for
the analog signal only has to support the accepted
tolerance of the 1GHz signal. That may be only
a couple of hundred MHz. So the board may only
have to support up to 2 GHz.
In terms of the 1 GHz data signal, things are a little
different. In order to maintain a decent square wave,
the board might have to support signals as high as the
7th harmonic of the fundemental or higher. This allows
all the significant harmonics to be used to construct the
square wave signal without severely distorting it. That
could easily put you out to 7GHz or higher.
- Doug McKean
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