[sdiy] Maxim analog switch ICs

[René Schmitz]

Hi Harry and List,

> (I admit, I didn't look yet)  I presume you are going to locate the
> analog switch at the summing junction of an opamp.  If you use the
> 4000 series CMOS... you can bias the ground pin 0.7V negative...
> the control signals will still work, and bipolar signals can be handled.

Right, yet the best operating point for the switch is halfway between 
its supplies. So I used +-5V. Luckily the Vss pin can be used for a 
level translation, so that one can work with 5V logic signals.

> You can aslo put an "on" switch in the feedback loop and
> cancel nonlinearity as well...
> 
> (if you didn't think of all this already :^)

Sure, that would squeeze the outmost in performance out of the switches.
But I think even without that the nonlinearity should be negligible.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159