How do I start with this question?

There are 2 transistors which are more complicated and I have no clue on how to start working on it.

The transistors shown in the figure below operate in the active region and have \$ \beta=100\$ and \$V_{BE}=0.7\$ V. Determine \$I_C\$ and \$V_{CE}\$ for each transistor.


simulate this circuit – Schematic created using CircuitLab

  • 4
    \$\begingroup\$ Start by working out how much base current flows into Q1. Hint: 15V supply, 0.7 base emitter voltage 1.43M resistor. I can see it's 10uA without pressing a button. \$\endgroup\$
    – Andy aka
    Jun 4, 2015 at 8:39

1 Answer 1


The 1.43M resistor will provide you Q1 Base-Emitter current (and then Ic), with which you can determinate Q2 Base voltage. Then, Ic and Vce for each transistor is straight ahead.

  • \$\begingroup\$ Then you can further refine Vce for Q1 to account for Ib into Q2. \$\endgroup\$
    – user16324
    Jun 4, 2015 at 10:05

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