9.3.1. Base Emitter Junction Biasing

Try these first

1. 1.

   What does V_BE represent in a BJT?

   Hint

   Think about the voltage that turn the transistor on.

2. 2.

   Define I_C in the context of BJTs.

   Hint

   Remember it flows out, not in.

3. 3.

   What is the role of the base-emitter voltage (V_BE) in a BJT?

   • It determines the collector current
   • It determines the collector voltage
   • It adds noise to the circuit

   Hint

   Think about what turns the transistor on.

4. 4.

   True or False: A higher β value in a BJT is undesirable.

   • True
   • False

   Hint

   Recall what β represents.

5. 5.

   If V_BE increases gradually from 0.6V to 0.8V, what happens to I_C assuming β remains constant?

   Hint

   Consider the BJT's exponential current-voltage relationship.

6. 6.

   Calculate I_C if I_B is 15 µA and eta_F is 150. What will happen if V_BE decreases below 0.6V?

   Hint

   Review the BJT operation regions.