[time-nuts] HP 3586A/B/C entirely referenced to 10MHz: Asolution

Hal Murray hmurray at megapathdsl.net
Mon Mar 21 23:21:11 EDT 2011

> "Initially, the intent was to use the MSBOUT (Most Significant Bit) output
> pin as the LO source. This would have been great since the output is
> TTL-leveled, exactly what the SLM phase detector is designed to work with.
> Unfortunately, this MSBOUT signal is not a clean square wave. There is some
> rollover in the DDS engine happening every few milliseconds, stretching the
> pulse repeatedly. This caused some modulated noise on the audio. Rejected." 

Clock jitter is the time domain view of phase noise in the frequency domain.

In this case, jitter by whole cycles is the time domain equivalent of spurs.

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