[time-nuts] 1 PPS 50-ohm driver

Stewart Cobb stewart.cobb at gmail.com
Sun Apr 17 00:58:39 EDT 2016


Here's a scope photo from a PPS driver built exactly to the description in
my earlier post.  It's a 74ACT04 in a TSSOP package, with five parallel
outputs driving five 220-ohm resistors (0402 SMT) to form a 50-ohm output.

The photo shows 2 ns rise time for the leading edge of the pulse. The scope
bandwidth is around 1 GHz, so this measurement is pushing its limits.  The
pulse looks fairly clean, but with a bit more care in layout and cabling,
it might get even better.

Cheers!
--Stu
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