[time-nuts] distribution amplifier

[Hal Murray]

>> I tried this with a Maxim video amp, and my 10MHz noise floor went
>> from  -155dBc/Hz on the input to about 80-90dBc/Hz on the output
>> of the amp.
 
>> 80dBc is great for Video (generally arund 50dB SNR), but for timing
>> it's a catastrophe...

> That's interesting.  The MAX477 video amp that is used in the TADD-1
> (http://www.tapr.org/kits_tadd-1.html) does a lot better than that.
> Here is a phase noise plot of the TADD-1 at 10MHz; it is better than
> -105dBc at 1Hz and reaches a noise floor of -142dBc at less than
> 100Hz. 

Where does that sort of noise come from?

Power supply ripple?  Ground loops?  Other mechanisms?


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