--------
In message <1429713386.29372.25.camel@D2>, Ken Peek writes:

>and balancing JFET switch transitions
>during an ADC cycle is the "secret sauce" that is at the heart of the
>3458A's stellar INL spec.  No one else has that.  No one else ever will.
>*WAY* too expensive for even Keysight to redesign these days.  Just is
>not going to happen...

Sorry to burst your bubble, but I'm pretty sure that's an integral
feature of a number of ADC chips already.

Probably something about a patent expiring...

PS: There's a very instructive walk through the HP multislope in AOE3.
Doesn't really go into the 3458 much, but they lay out how the subsequent
versions in 34401/34972 do things.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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