9.2.2. Comparison of p-n-p and n-p-n Transistor

Try these first

1. 1.

   What type of materials make up a p-n-p transistor?

   Hint

   Think about the material types designated in their names.

2. 2.

   What does β represent in a transistor?

   Hint

   It's a measure of how much current is amplified.

3. 3.

   What is the primary difference between a p-n-p and an n-p-n transistor?

   • p-n-p has a negative base-emitter voltage
   • n-p-n has a p-type emitter
   • p-n-p has a p-type emitter

   Hint

   Think about the definitions of 'p' and 'n'.

4. 4.

   True or False: The gain of a transistor is denoted by gamma (γ).

   • True
   • False

   Hint

   Recall the Greek letters associated with transistor characteristics.

5. 5.

   If given a p-n-p transistor with a gain (β) of 120 and a base current (I_B) of 10 µA, what would be the collector current (I_C)?

   Hint

   Use the gain formula to determine the collector current.

6. 6.

   In a circuit using both p-n-p and n-p-n transistors, how would you determine which one to use for a particular amplification requirement?

   Hint

   Understand the conditions under which each operates best.