Varicaps - Value is measured or calculated?

Discussion in 'General Electronics Chat' started by atferrari, Nov 11, 2010.

  1. atferrari

    Thread Starter AAC Fanatic!

    Jan 6, 2004
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    Could not find how the capacity of a varicap (or any diode for the case) is obtained.

    Is it actually measured? I do not see how you could (?)

    Or are they used in a VFO and their capacity calculated?
     
    Last edited: Nov 11, 2010
  2. Papabravo

    Expert

    Feb 24, 2006
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    AFAIK the capacitance is a function of the bias voltage. The datasheet should have a range specified.
     
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  3. eblc1388

    AAC Fanatic!

    Nov 28, 2008
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    Varicap diodes are operated with reverse bias and thus takes nearly no current .

    The following circuit will measure its capacitance against reverse DC voltage, using a common capacitance meter.

    [​IMG]
     
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