[time-nuts] reference oscillator input circuit

[Rick Karlquist]

The document cited is full of plausible sounding but misleading
information, if you want really low jitter.  This type
of oversimplification of the problem was present when the
HP53131 series counters were designed, with the result that
the Allan deviation of an external 10 MHz reference is degraded
to only a part in 10^11 at 1 second.

Rick Karlquist


jimlux wrote:
> John Ackermann N8UR wrote:
>> Wenzel has some discussion and circuits at:
>> http://www.wenzel.com/documents/waveform.html.
>>
>> The Shera GPSDO made clever use of the input circuit of a 74HCT4046 PLL
>> chip for squaring.
>>
>> John
>> ----
>>
>
> Doh... I was thinking that there was some vendor with ap notes on stuff
> like this, and I couldn't recall who it was, and I'm actually looking at
> a Wenzel OCXO sitting here on the desk.
>
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