Common Base output characterstics

Discussion in 'The Projects Forum' started by rudra, Dec 29, 2010.

  1. rudra

    Thread Starter New Member

    Dec 29, 2010
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    0
    Hi All,
    i m confuse in common base output characteristics of NPN Transistor that why the Collector current drops and goes to zero ,when there is increase in negative values of Vcb.....I know it goes in Saturation Region....but what exactly happens when we increase in fwd bias of collector base junction in this case.....i mean when we increase forward bias the current should increase but it decreases......
    Please help me out.............:confused: :confused: :confused:
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    Read up on the CB amp here in the AAC ebook.

    hgmjr
     
  3. rudra

    Thread Starter New Member

    Dec 29, 2010
    3
    0
    To hgmjr,
    Sir it does not explain the output characteristics.....
    Pls help......
     
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    The collector voltage of an NPN common base transistor stage is controlled by holding the base at a constant voltage and then driving the base so that the base-emitter junction is either reverse biased (NPN in cutoff) or forward biased (NPN in saturation).

    hgmjr
     
  5. rudra

    Thread Starter New Member

    Dec 29, 2010
    3
    0
    Pls explain me in detail............


    and what is the way to download attachments in all about circuit forums...

    I m a newbie here.....I want to download attachment Id 466
     
  6. hgmjr

    Moderator

    Jan 28, 2005
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  7. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I think you meant emitter.:)
     
  8. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    I beg to differ. I just read through the CB Tutorial and it's exceedingly thorough, concise and accurate. It's also well documented with schematics and graphs. Off hand, I can't think of a single thing to add to it. ;)
     
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