diode BB139 graph

Discussion in 'Homework Help' started by babyboyx, Sep 23, 2009.

  1. babyboyx

    Thread Starter Member

    Jun 2, 2009
    12
    0
    with just this data sheet of this diode, how do draw a IV and a CV graph.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    The diode you show is a special type.
    It is a so called varicap diode.
    It is mounted in reverse and uses the voltage across the diode to control the capacitance.
    Attached you will find two datasheets.
    an AM varicap diode BB212
    AND a small signal diode 1N4448

    Greetings,
    Bertus
     
  3. babyboyx

    Thread Starter Member

    Jun 2, 2009
    12
    0
    so that mean the graph i cn base on the bb212 to draw . But how it related to the 1N4448 ?
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    I showed you the two datasheets to see the difference between the varicap and a conventional diode.
    The BB139 will have a capacitance curve in reverse mode.
    The capacity will be lower as the BB212 as the BB139 is for VHF and the BB212 for AM.

    Here is also a page from the EDUCYPEDIA on several diode types:
    http://www.educypedia.be/electronics/composemiconductordiode.htm

    Greetings,
    Bertus
     
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