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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: hobby electronics
Date: Wed, 3 Jul 2024 13:49:07 +1000
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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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