14.1.2. Analysis of simple non-linear circuit containing a BJT

Try these first

1. 1.

   What is the primary function of the base current in a BJT?

   Hint

   Think about how the base current influences the transistor's action.

2. 2.

   What does KCL state?

   Hint

   Consider current paths at junctions or nodes.

3. 3.

   What is the primary role of a BJT in a circuit?

   • Switch
   • Amplifier
   • Oscillator

   Hint

   Consider how it influences signal strength.

4. 4.

   True or False: KVL states that the sum of the voltages around any closed loop is zero.

   • True
   • False

   Hint

   Reflect on how voltage drop and sources relate in loops.

5. 5.

   In a BJT amplifier with a common emitter configuration, if the base-emitter voltage, V_BE, is 0.7V and the saturation current, I_S, is 1 μA, compute the collector current, I_C. Consider thermal voltage, V_T, to be 26mV.

   Hint

   Use the exponential relationship defined for a BJT.

6. 6.

   If a BJT is operated at a collector current of 100 mA and has a beta value of 50, how much base current is required? What happens if the beta drops to 25?

   Hint

   Focus on the formula relating the collector current, base current, and beta.