[volt-nuts] The "averaging reference"

Poul-Henning Kamp phk at phk.freebsd.dk
Thu Dec 18 14:05:56 EST 2014

In message <5492F59E.8060808 at free.fr>, Joel Setton writes:

>In my search for the Perfect Volt, I'm thinking about building a 
>reference voltage generator which would average the voltages generated 
>by 8 or 10 REF102CP chips (with a simple resistor network), mounted in a 
>temperature-controlled box.

The problem with averaging a bunch of the same type of chip is that
you cannot average out the systematic errors of that chip.

If you want to do it "right", you should average all sorts of
different (but obviously: good) chips, possibly assigning them
different weight depending on their qualities.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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