[SI-LIST] Re: Serpentine Traces
- From: Ray Anderson <Raymond.Anderson@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 9 Sep 2002 12:42:48 -0700 (PDT)
jeff.w.loyer@xxxxxxxxx wrote:
>I'm not familiar with the term "group delay" in your original context. If
>you're talking about matching the propagation time of a group of signals (a
>bus), it's a very common practice (often using serpentines). Is that what
>you mean?
>
Group delay is a common concept in radio communications. Mathematically,
it is defined as -(dPhi/dF) (the negative of the rate of phase change
with respect to frequency). The result has units of time.
As a practical matter, it manifests itself as causing certain frequency
components of a signal to be delayed relative to other components in
that signal. This unequal delay across frequency leads to distortion of
the signal.
For more info on the topic, May I suggest you check out this nicely
written tech note on Group Delay:
http://www.radiolab.com.au/DesignFile/DN004.pdf
-Ray Anderson
Sun Microsystems Inc.
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