[sdiy] S&H question

[Scott Bernardi]

Depends on your definition of "better". You can probably get the 
absolute best specs with discrete designs. I've used the LF398 because 
of the low parts count, and they are relatively cheap (under $2).

Scott Juskiw wrote:

> Looking at some old schematics I see that many sample and hold 
> circuits use an n-channel FET (typically 2N3819) to sample the input 
> signal. When I look at more recent schematics I see these new fangled 
> bilateral switches (CD4066 or DG213) or purpose built S&H chips 
> (LF398) being used instead of a FET. I've only used a FET in the past 
> and have been reasonably happy with it. Are these bilateral switches 
> or LF398 really that much better? The application is a ribbon controller.
>