More thoughts on building a Z-80 (64bit!!!)

From: Allison J Parent <allisonp_at_world.std.com>
Date: Thu Oct 22 21:33:53 1998

< > I know that Track get very touchy at 900Mcyc speeds but, I also knew t

I've done RF, at that very touchy part starts at around 50MHz, by
100-200MHz coils are simple lengths and at 470mhz anything longer than
1/4" becomes significant. I did a power amp at 512mhz and the whole
tuning and interconnect was all carefully calculated lengths of tracks.
Even the board material and thickness was critical! I was lucky with
the RF I could use one whole side as a ground plane! Oh, and quarter
wave lines at operating clock speeds is a real nasty.

< It helps to have some idea of RF and microwave design before attempting
< to build a 1GHz circuit. Otherwise you are wasting your time. This is no
< something you can fiddle with until it works unless the underlying
< design and layout is sound.

Like Tony said, guessing will have you making whole new baords for
small changes.

Allison
Received on Thu Oct 22 1998 - 21:33:53 BST