[time-nuts] Advice on 10 MHz isolation/distribution

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Feb 20 03:51:07 UTC 2010


life speed wrote:
> If I can believe the simulation (a big if) the ADA4899-1 can provide 90 dB isolation at 10 MHz, rolling up to 70 dB at 100 MHz, when configured with a gain of +2
>
> The subcircuit model provided by ADI is useless for noise, unfortunately.  I guess I'll have to build and measure, which I don't mind doing.  Unless it turns out to be a waste of time, and I should have just used the transistor circuit.
>
> Clay
>
>    
Its easy to calculate a lower bound to the amplifier phase noise floor 
from the signal level at the output and the amplifier output noise due 
to feedback resistors together with the amplifier input voltage and 
current noise.
The actual phase noise floor  may be a few dB higher.

Bruce




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