capacitance

Discussion in 'Homework Help' started by prejval2006, Oct 29, 2006.

  1. prejval2006

    Thread Starter Member

    Oct 25, 2006
    21
    0
    what is the application of diffusion and trasition capacitances
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,898
    1,722
    What is the context of your question? A capacitor is a capacitor in a circuit and we use them because that is the function we require.

    Typical applications are
    1- DC blocking
    2- Filtering
    3- Bypassing
     
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    I don't know that diffusion and transition capacitances have applications per se - but engineer types do have to account for their effects in some circuits. I suppose a varactor might be an "application" of transition capacitance. (Or am I remembering things backward?)
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    That is probably so - but what is a diffusion capacitance?
     
  5. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    3
    It's the capacitance caused by the minority charge carriers in the neutral regions. It is prominent only when the junction is forward biased. The value is not constant and depends on bias voltage.

    As far as I know there's no useful application for it, and like Thingmaker mentioned, we do have to account for it during design or modelling.
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    Thanks for the info. Sounds like the reason for junction storage and poor turn on/turn off.
     
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