Any attempts to provide long prop delays on high speed logic designs
that have small real-estate seem impractical. I believe rise time
becomes a significant percentage of the prop delay and impedance
matching over the entire bandwidth is a factor for reflection (ringing)
Also antenna effects need to be considered for crosstalk, susceptibility
and emissions.  However, 1/4 wave and 1/2 wave phase shifters often done
at 1GHz and up freq for RF.
-- 
regards,
Tony

Eng Manager     		Web:      http://cmac.ca
C-MAC Electronic Systems Inc.   Phone:    (204) 633-7200
1455 Mountain Avenue            Direct:   (204) 631-7030
Winnipeg, MB, Canada R2X 2Y9    FAX:      (204) 631-7294

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