7.6.2. Reverse Bias Condition

Try these first

1. 1.

   What is the function of the base-emitter junction in a BJT?

   Hint

   Think about where the current enters the transistor.

2. 2.

   Define minority carrier.

   Hint

   Consider their relation to majority carriers.

3. 3.

   What occurs at the base-emitter junction during normal operation?

   • It's reverse biased
   • It's forward biased
   • No bias is applied

   Hint

   Consider the current entry point into the BJT.

4. 4.

   True or False: The reverse current in a BJT is mainly due to the movement of majority carriers.

   • True
   • False

   Hint

   Focus on the definitions of minority and majority carriers.

5. 5.

   Given a BJT with a collector current of 0.1 mA under reverse bias at room temperature, calculate the expected reverse saturation current assuming a strong bias.

   Hint

   Use the basic relationship between current, bias, and physical properties of the transistor.

6. 6.

   Explain why BJTs become less efficient at high temperatures when operating with a reverse bias condition.

   Hint

   Consider the relationship between temperature and semiconductor physics.