[time-nuts] Building a DMTD/phase noise set in the 21st century
Poul-Henning Kamp
phk at phk.freebsd.dk
Fri Aug 30 09:45:04 UTC 2019
--------
In message <5D68C7EF.6080007 at telight.com>, ed breya writes:
>I think there may be some confusion over the "super-capacitor" term.
I did some characterization of various kinds of large capacitors
some years back, and my conclusion was that environmental effects
scale super-linearly with capacitance for almost all types.
If you want stable capacitance, silver-mica and picofarads it is.
Next best is plastic-foil and unfortunately Teflon seems to be best
and unobtanium, except as soviet surplus, with prices jacked up
because of audiohomoepathicians.
The temperature-sensitivity of all electrolytics is different from
pretty much any other type of capacitor, in that it has a component
related to chemical reactions. That makes them totally unsuitable
for filtering any voltage references.
--
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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