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

[Bob Camp]

Hi

Digitizing two signals and winding up 170 db down is maybe a bit more complicated than just going to quadrature and getting rid of the need to do so…. at least for a one off application.

Bob


On Dec 5, 2012, at 9:00 PM, Jim Lux <jimlux at earthlink.net> wrote:

> On 12/5/12 2:45 PM, Marek Peca wrote:
>>> This last idea is interesting... could be simulated by Matlab or similar.
>> 
>> It is known to work in ordinary non-linear transistor-based mixers. It
>> will produce more messy spectrum than double-balanced mixer, however,
>> for this purpose and completely within digital domain, it makes
>> absolutely no harm, in my oppinion. On the other hand, simplicity of two
>> resistors & ADC may help.
>> 
> 
> for that matter, fit two sinusoids to the two inputs (which will inevitably be at different frequencies, eh?)
> 
> 
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