CMOS vs JFET switches

[John Geary]

Here is a question I forgot to bring up at the ESO workshop.  Maybe some of
you would like to comment.

I note that some folks use fast CMOS switches (e.g. 201HS and DG271) for
signal processing duties, while others stick to the slower JFET switches for
such things as the CDS reset and integrator reset & sample.  Any particular
reasons to go with the slower JFETs, anyone?  Are there noise or charge
injection or other issues here that cannot be seen in the data sheets?

BTW, for some reason, I thought this last ESO fest was one of the most
productive meetings on CCDs in recent memory.  Don't know what the cause
was, but congrats to all involved, and keep up the good work.

--JG