IE = (1 + β)IB ≈ βIB ≈ IC What does the (1+β) mean?

Discussion in 'General Electronics Chat' started by ninjaman, Aug 28, 2016.

  1. ninjaman

    Thread Starter Member

    May 18, 2013
    306
    1
    Hello,
    I have been studying transistors recently and have seen this a few times.
    IE = (1 + β)IB ≈ βIB ≈ IC

    What does the 1+B mean, where does the 1 come from?
    Is it something glaringly obvious because I have missed it. It isn't written in the text, does that matter or is it one of those things that you just except.
    Thanks
    Simon

    Hey, its almost christmas, yay!!!
     
  2. Veracohr

    Well-Known Member

    Jan 3, 2011
    552
    76
    Ie=Ib+Ic

    If Ic=Ib*beta, then Ic+Ib=Ib*beta+Ib, which is rewritten as (1+beta)*Ib.
     
  3. dl324

    Distinguished Member

    Mar 30, 2015
    3,246
    622
    Saying it in a different way:
     \small I_E = I_{B} + I_C = I_B + \beta I_B = (1+\beta) I_B
     
  4. SLK001

    Well-Known Member

    Nov 29, 2011
    819
    228
    It's beta, or hfe. These terms should be in your lessons.
     
  5. ninjaman

    Thread Starter Member

    May 18, 2013
    306
    1
    ignore this, i did the math, something i am not good at.
    thanks for the help
    simon
     
    Last edited: Aug 28, 2016
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