Re: Low noise amplification

On Sat, 10 Jun 2006 00:00:28 +0100, in sci.electronics.design Pooh
Bear <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:


John Larkin wrote:

On Fri, 09 Jun 2006 13:42:57 -0700, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Note that, if your signal source impedance isn't optimal for the first
opamp, you might be better off filtering first, using a bandpass
filter with different impedances at opposite ends. This will give a
free, noiseless voltage gain ahead of the first gain stage and also
zap noise that could clip the amp.

That would of course be a passive LC filter.

I'm glad someone made that point !

Graham

digital passive or analogue passive?


martin
.

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