On Mon, 05 Jan 2004 02:40:07 +0000, Paul Burridge
wrote:


Rubbish. Varactors are not used for freqency mulitplication.

If you are determined to be arrogant, it helps to occasionally be
right. Varactors are still used for frequency multiplication. They
were also commonly used as parametric amplifiers and mixers before
other semiconductors got fast enough to work at microwave frequencies.
Varactors were even used as paramps in the front ends of opamps.

Google "varactor frequency multiplier" and "parametric amplifier" and
maybe learn something.

John