[time-nuts] Re: DIY Low offset Phase Noise Analyzer (Erik Kaashoek)

[Magnus Danielson]

Mike,

He was using an analog mixer, but your comment about XOR mixer does not 
apply to analog mixers. Your oversimplification that analog mixer and 
XOR gates being the same thing does not apply here, and thus the 
assigned missbehavior does not carry over to the analog mixer case.

Cheers,
Magnus

On 2022-07-05 12:27, Mike Monett via time-nuts wrote:
> Eric,
>
> Another problem I forgot to mention, the exclusive-or phase detector has a
> severe output ripple. This will cause frequency shift in the oscillator
> frequency which will show up in the measurements.
>
> The phase-frequency detector has zero ripple at lock. There is a small
> transient at the sample time, but this is easily filtered with a simple low
> pass filter.
>
> With zero ripple in the output, the PFD will not cause any shift in the
> oscillator frequency. This will not cause any error in the measurements.
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