Re: hobby electronics

On 3/07/2024 8:42 am, john larkin wrote:

On Tue, 2 Jul 2024 23:06:54 +0200, Gerhard Hoffmann <dk4xp@arcor.de>
wrote:
 

Am 02.07.24 um 20:27 schrieb Jan Panteltje:

<snip>

I need a microvolt precise unity-gain follower with nV and fA noise
and low bias current, but no opamp like that exists, and jfets are too
drifty.
 AD8675 is about the closest I can find.

If you temperature stabilised your junction FET to a milli-degree or so, it would be less drifty.
There are monolithic dual junction FETs
https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5535/7e8069_e8cb0edf8dc64ae79ae575c7a40c2828.pdf
--
Bill Sloman, Sydney
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