help me!

Discussion in 'Homework Help' started by chyadesh, Aug 28, 2009.

  1. chyadesh

    Thread Starter Member

    Apr 10, 2009
    19
    0
    Q) can u please tell me the difference between the reverse active region and forward active region.? please provide ur answer with suitable example so that i can understand it well....
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    For what components are you looking for?

    Greetings,
    Bertus
     
  3. wwchieh

    Member

    Apr 25, 2009
    14
    0
    I am guessing that you are asking about BJT.

    Let's take BJT npn for example. In BJT npn, we have a higher doping n-sub than the other n-sub. Usually, the higher doping n-sub will be the emitter and the lower doping n-sub will be the collector.

    Forward active region is occurred when the base-collector is in reversed bias and the base-emitter is in forward bias. The current enters from collector and exits from emitter.

    Reverse active region is occurred when the base-collector is in forward bias while the base-emitter is in reversed bias. The current enters from emitter and exits from the collector.

    Forward active region has a higher gain than reverse active region. So, we prefer to use forward active region in amplifying our circuits.
     
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