[time-nuts] Very challenging phase noise measurement, does anyone have an idea??

[Marek Peca]

>>> running mode and lock the other one to the first one using an XOR gate 
>>> and then use the output of the XOR gate as an output signal. However, 
>>> we are wondering if any of you know a better idea. Maybe there is an 
>>> off-the-shelf piece
>
> Nearly any idea is better than the XOR gate you proposed. A simple 
> double balanced diode mixer followed by an LT1028 preamp would easily 
> meet your needs.

What about simply mixing two signals in a resistor network, sampling by 
ADC, and mixing purely in DSP domain on a non-linearity (e.g. f(x)=x^2)?

Regards,
Marek