"i3hev, mario held" wrote
Reg Edwards wrote:

Regardless of an amplifier's gain, the signal to noise ratio at
its
output remains the same as the signal to noise ratio at its input.

Obviously - if its a linear amplifier!

I'm afraid this is quite wrong

Your statement would be a correct one if and only if the amplifier
is a
non-noisy one - which, alas, is not a real case...

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If an amplifier incorporates a noise generator or also behaves as a
filter, then it is no longer just an amplifier. My statement is quite
correct.
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Reg.