common emitter amplifier

Discussion in 'Homework Help' started by full, Dec 7, 2014.

  1. full

    Thread Starter Member

    May 3, 2014
    225
    2
    hello everyone
    I did new problem
    from common emitter
    please see my solution true?
    I think there is something wrong in DC analysis!
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    I can do a quack check

    Vb ≈ 6* 250/(250 + 75) ≈ 4.6V and Ie ≈ (4.6 - 0.7)/0.7 ≈ 5.56mA. But Ie_max = 6/(1 + 0.7) = 3.5mA
    and because Ie>>Ie_max transistor is in saturation.
    But if we do more precise calculations I find
    Ie = 3.08mA and Ic = 100/101 * 3.08 = 3.05mA
    Vce = 6 - 1*3.05 - 0.7*3.08 = 0.794V Transistor is on the edge of a saturation, very poor design.
    And the gain is around -36V.
     
    full likes this.
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,766
    1,101
    So can a doctor, or AudioGuru :)
     
    full likes this.
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