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Analog electronics (BJT circuit analysis)

  1. Dec 9, 2016 #1
    1. The problem statement, all variables and given/known data
    upload_2016-12-9_20-6-1.png
    For beta = 100 and assuming ro is very large, what is the DC voltage at the collector?

    2. Relevant equations
    IB = IE(β+1)

    IC = β*IB

    3. The attempt at a solution
    Since IE = 0.5mA, IB = 0.0505 A
    Then, IC = 5.05 A (which doesn't feel right)
    VC is the same potential across the 30kΩ load?
    I tried doing KCL with those currents (to find the current thought the load resistor).
    Should I not be analyzing the direct circuit--should I make an equivalent T-model?
     
  2. jcsd
  3. Dec 9, 2016 #2

    Charles Link

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    Homework Helper

    Your equation should read ## I_E=I_B (\beta+1) ##. Try again. I think you also need to assume ## V_{BE}=.7 \, volts ## (approximately). One hint for you: The capacitors basically block any steady state current trying to go through them so the capacitor is an open circuit for the DC part of the analysis.
     
    Last edited: Dec 9, 2016
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