piclist 2008\07\27\210901a >
Thread: Low Noise, High Gain Amplifier
www.piclist.com/techref/index.htm?key=low+noise+high+gain
face picon face BY : Sean Breheny email (remove spam text)



Hi Fred,

Either way can work if done properly. I've gone back and forth on this
philosophy. It is much like shielding. Many people think that they can
just "throw" a technique at a project and fix their problems. Just
putting a messily-radiating device inside of a shielded box rarely
fixes the problem, yet there are cases where shielding is an
indispensable part of the RFI solution. Similarly, just putting analog
and digital grounds on two separate planes without thinking through
the implications of that is likely to cause more problems than it
solves.

My overall guess would be that it would be better to use a single
ground plane. If you use a differential input as I suggested, that
should help to prevent picking up differences in ground potential as
signals.

Sean


On Sun, Jul 27, 2008 at 8:17 PM, fred jones <EraseMEboattow.....spamhotmail.com> wrote:
>
> Thanks Sean,
> I really appreciate all your help.  Could you comment on PCB layout for me?  Should I create one ground plane or should I take the digital sections and place them on their own plane and put the amplifiers on their own ground plane?  Again, thanks so much for taking the time to offer advice.
<e726f69f0807271808n571fee01le84344ca30301863@mail.gmail.com> 7bit

In reply to: <BLU149-W15528E90D5153CA7AE0B1CBB830@phx.gbl>
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