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varactor

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
va·rac·tor  (v-rktr, v-)
n.
A semiconductor device in which the capacitance is sensitive to the applied voltage at the boundary of the semiconductor material and an insulator.


varactor [ˈvɛəˌræktə]
n
(Electronics) a semiconductor diode that acts as a voltage-dependent capacitor, being operated with a reverse bias Compare varistor
[probably a blend of variable reactor]


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Intended for researchers and practicing RF engineer, the book describes different oscillator noise models, voltage-controlled oscillators (VCOs), MOS varactors and spiral inductors, wideband VCO circuits, and phase noise reduction techniques.
Focusing on radio-frequency applications in low-cost technologies, they describe the most important design rules for optimizing the performance of an integrated varactor, and derive some wide-band electrical models in a manner that allows their performance to be predicted accurately.
The existing design options for mobile TV antenna tuning (such as varactor diodes or bulk-CMOS switched capacitor banks) do not meet these power handling requirements.
 
 
 
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