[time-nuts] GC-1000 Clock Cap Choice?
magnus at rubidium.dyndns.org
Wed Jan 19 20:26:20 UTC 2011
On 01/16/2011 11:15 PM, Poul-Henning Kamp wrote:
> In message<4D336A19.40709 at freenet.de>, "Dr. Frank Stellmach" writes:
>> High cap value Ceramics are available since years, [...]
> Can you clarify one thing for me: When I studied datasheets for these
> it looked like they drop 50% of their capacitance at a DC voltage
> of 10-20V.
> Doesn't that make them a so-so bargain for power supply bulk capacitance ?
High dielectric "constant" comes at a high price performance wise. :)
You gain some, you loose some. Temperature performance and linearity.
It should not come as a surprise if you start to think about what
happens on the atomic/molecular level of dielectrics, it's a combination
of electrostatics and "mechanical" stress.
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