From: Watson 'Atto Parsec' Name
Newsgroups: sci.electronics,sci.electronics.basics,sci.electronics.design,sci.electronics.components
Subject: Re: hi-capacity voltage controlled capacitor?
Message-ID:
References: <4a96bae1.0210080832.1b020bd6@posting.google.com> <4a96bae1.0210082023.565ea384@posting.google.com> <3DA72D96.9F9514DE@NOSPAMboeing.com>
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Date: Sat, 12 Oct 2002 08:10:17 -0700
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In article ,
bigcat@meeow.co.uk talked about...
[snip]
> A row of caps and a row of FETs would do it. Perhaps you have
> something more elegant in mind.
If the FET has an on resistance of an ohm or so then it could lower the Q
of the capacitor drastically, especially if the cap was in a resonant
circuit. Capacitor ESR can be important.
> A ceramic cap with separate ac and dc paths would also work. dc bias
> controls capacitance, and the signal is ac coupled to it.
> Regards, NT
>
--
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