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BJT DC Biasing Question

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

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  1. Apr 18, 2016 #1
    frozone45

    frozone45

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    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. Apr 19, 2016 #2
    Ratch

    Ratch

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    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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