basic S&H specs.

[jhaible]

> I'm looking for some quick opinions on sample and hold performance.
> I've started to evaluate some circuits and realized I'm not sure what's
> "good" for synth work.  Although I don't need extreme performance, I
> want to be at least as good as the "average" S&H on the average synth.
> In general I want best possible droop rate without exceeding acceptable
> aquisition time,

May I ask you why exactly you want this ? I mean *if* you want minimum
aquisition time and maximum hold time, then go for a 2-stage solution
(fast analogue S&H with small capacitor, plus "digital S&H" with ADC,
latch, and DAC).
But "good for synth work" is something different. Most typical S&H
applications are clocked with a few Hz (fast LFO rate), so why worry
about low droop rate. Fast acquisition rate is more important, IMO.
Typical values I'm using are 47nF cap plus small signal FET switch,
or 1nF cap and CA3080 switch.

JH.