[SI-LIST] : Serpentine delays

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From: Patel, Bhavesh (bpatel@ciena.com)
Date: Fri Jun 01 2001 - 18:28:17 PDT


Hi!
 I had a question regarding serpintine delays that we use on clock and other
signals for matching property. My concern is stemming from some articles
that I have read, that serpentine delays should be avoided for clocks & if
it has to be done then you need to increase the spacing between the adjacent
same trace in order to reduce the effect of 'NEXT'(near end crosstalk). Now,
say if I route a serpintine stripline trace with spacing =15mil(between
adjacent), width=5mil, height from closest gnd plane is 4mil.I simulated the
crosstalk @133Mhz and it is approx. 8mV. Now, when I take the total
crosstalk for the trace do I multiply this 8mV with the number of U-bends I
have?
Also if I can get some feedback on some of the pitfalls with serpentine
delays especiaaly clk.
Thanks in advance
Bhavesh Patel

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