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From: Phil Allison on 27 Apr 2010 11:58

"Jitt"

> Picohenries? 10KHz? Fishy


** Eeeeeyuup ....

We have ourselves a genuine live one here - folks.

Needs to be kept on the hook long as possible.




..... Phil




From: whit3rd on 27 Apr 2010 15:32
On Apr 26, 8:24 pm, "Dave" <db5...(a)hotmail.com> wrote:
> Does anyone know if one can test a varactor to see what capacitance it is
> exhibiting while it is being used to tune a circuit?

Characterize the varactor's C-V curve out of circuit, then
monitor the (average, DC bias) voltage on the varactor
(which can be done without disturbing the AC operating conditions).

Some varactor uses (frequency doubling) with high AC
excitation can't be usefully probed this way. That's because
the 'capacitance' is a linear characteristic, and varactors
are intrinsically not linear devices.
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