TRANSISTOR

Discussion in 'General Electronics Chat' started by whale, Jan 13, 2009.

  1. whale

    Thread Starter Active Member

    Dec 21, 2008
    111
    0
    IN BJT,
    THE COLLECTOR CURRENT IS PRODUCT OF GAIN(β) AND BASE CURRENT.

    AND β IS ALLWAYS GREATER THAN UNITY.

    SO,THE CURRENT AMPLIFICATION TAKES PLACE ONLY WHEN INPUT SIGNAL CURRENT IS BASE CURRENT.
    BUT WHEN WE CONSIDER CE CONFIGURATION,THE INPUT SIGNAL IS GIVEN BETWEEN EMITTER BASE TERMINAL,AND THE INPUT SIGNAL CURRENT IS EMITTER CURRENT,WHILE THE BASE CURRENT IS DUE TO REMAINING CHARGES WHICH HAVE NOT CROSSED THE BASE COLLECTOR JUNCTION,
    THEN HOW CAN WE RELATE BASE CURRENT FOR AMPLIFICATION ?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You might find some useful knowledge in the transistor section in our Ebook - http://www.allaboutcircuits.com/vol_3/chpt_2/8.html.

    In a common emitter setup, the signal does supply current into the base. The emitter handles both base and collector currents.
     
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