Quoting "Van Horn, David" <david.vanhorn@backcountryaccess.com>:

>
> I'm looking for a way, hopefully not too complicated, to gate =20
> signals on and off without inducing more than maybe 100nV of =20
> disturbance.
> The signals may be at ground, or may be riding on a volt or two.
> "off" means more than 30dB reduction.
>
> Any ideas?

Some of the better commercial analog switches have a charge injection =20
of < 1pC.

To get a 100nV of disturbance implies a load capacitance of 5-10uF.

So if your source impedance is 1K you'd have a bandwidth of maybe 30Hz, whi=
ch
might be limiting.

--sp



--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.