Re: To JT : non T analog switches?

Hello Fred,


Sorry Joerg, but I didn't give all the story.
pA level leakage, low charge, but also few 10s of nV level thermal recovery,
high isolation on high impedance and low noise. I'm afraid a diode bridge
won't do.


That may not be a job for diodes. Although you can achieve zero charge injection.


This is for a sample&hold or more precisely a block and pass switch (don't
know how to call that better) which will be ahead of my low noise
preamplifier and will allow the DUT transient recovery analysis without
suffering from the low noise preamplifier recovery. (few 10s nV accuracy
after a 0.5V transient).


As Win said a saturation-proof amp would help. Also, look at T/R switches such as those used in ultrasound equipment. There we have to stomach pulses up to 200V and the receiver has to be able to hear the grass grow within a usec or so after that.

Regards, Joerg

http://www.analogconsultants.com
.