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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