S&H

[Martin Czech]

> Does anyone have a good sample and hold. I thought I would try
> something in the way of pot reduction, but everything I have
> tried starts to leak sooner or later. Has anybody tried those
> s&h chips Paul S. sells. Got any ideas?
> 
> What I would like to be able to do is. Apply and sample a  voltage.
> Then remove the source and the sampled voltage stay where I left
> it for a long long time.
> 
> I have tried fets/otas/3900s/4016s....? and all kinds of caps but
> polystyrene types seem to be the best.
> 
If you want an analog s&h with low droop, you should check out the National
App notes (can't renember Number now).
I've posted that a time ago. A two stage s&h is described, short aquisition,
long hold time.

m.c.