[time-nuts] Very challenging phase noise measurement, does anyone have an idea??
Rick Karlquist
richard at karlquist.com
Thu Dec 6 02:23:25 UTC 2012
Bob Camp wrote:
> Hi
>
> You might be surprised by the noise floor of an XOR run at 125 KHz. They
> are quite good at that low a frequency.
>
> Bob
An XOR, unlike a mixer, does not have a null when the
phases are in quadrature. This is the fundamental problem
with using it as a phase detector.
Rick
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