Sat 25 Feb 2006
Here is an older application note from the former Motorola semiconductor division regarding transmission lines effects of PCB traces. A more thorough source of information is the MECL Design Handbook, but this is a good reference with both theory and examples. If the rise or fall times of your designs are approaching the round trip (source to farthest load back to source) with loading, then transmission line effects of PCB traces must be taken into account.
( AN1051.pdf )
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April 23rd, 2008 at 9:58 pm
[...] emitter coupled logic (M ECL) circuits. I don’t know if Motorola was first, however, they had plenty of expertise on the subject. The made ECL useful in those days was the incredibly fast switching rate for these types of logic [...]