Re: breadboarding picosecond stuff

On Wed, 09 Jan 2008 13:44:52 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:


I'm testing an MC10EP16VS part, a fast si-ge ecl buffer that has
programmable output swing. A simple copperclad breadboard works very
well, with fairly clean 200-or-so ps edges. The end-of-step drool is
fairly common on very fast stuff, which is why lots of people specify
20-80 percent risetimes, instead of the more common 10-90, for really
fast edges. It may get a little better on a real pc board.

ftp://66.117.156.8/P_Benchtop.jpg

ftp://66.117.156.8/P_Closeup.jpg

ftp://66.117.156.8/P_RiseFall.jpg


The other circuit, lower-left, is a gaasfet thing that was interesting
but didn't work very well.

John


The "drool", as you call it, is probably due to the chip using
resistors instead of current mirrors... ala VERY OLD style ECL.

...Jim Thompson
--
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