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BJT DC Biasing Question

Discussion in 'Electronics Homework Help' started by frozone45, Apr 18, 2016.

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  1. frozone45

    frozone45

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    0
    Apr 18, 2016
    For part b of the problem in the attached picture, I have determined that the upper limit for the value of VBB, for the transistor to remain active, is 15 [V]. I can not seem to find the lower limit for the value of VBB, for the transistor to remain active. Does anyone know what I am missing in my understanding of part b of the problem in the attached picture?

    My attempt at answering the question is shown in the attached picture. IMG_0532.JPG
     
  2. Ratch

    Ratch

    1,092
    333
    Mar 10, 2013
    The book wants you to find the range of Vbb for saturation and cutoff. The value of Vbb for saturation is ((Vbb-0.7)/(100*Rb))*100*Rc=15-1, where 1 is the voltage across the transistor during saturation. Solving the equation gives Vbb=14.7 volts. Just above cutoff occurs at Vbb=0.7 volts. Therefore, the range of Vbb is 0.7<Vbb<14.7 .

    Ratch
     
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