[time-nuts] ? phase comparison or other device

Pete peterawson at earthlink.net
Sat Jun 30 11:57:26 EDT 2007


Magnus,

This discussion is why I have allowed the ADA4899-1 to saturate in the ZCD
posted earlier. The transition times up & down in the second stage are 350 
to
400 ns; thus I believe the <50ns overload recovery doesn't degrade the
measured jitter. With 500MHz 'scope bandwidth, the 1KHz squarewave
output has <1% over/under shoot & appears noise free at the zero crossing.

The output transitions are fast enough for my HP 5370A to  show < 1ns
jitter over 1K or 10K samples.

Regards,

Pete Rawson 




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