5.2. Characteristics

Try these first

1. 1.

   Describe the input characteristics of a BJT.

   Hint

   Think about how current behaves when you apply voltage.

2. 2.

   What are the three regions of operation for the output characteristics?

   Hint

   Recall the acronym SCA we discussed.

3. 3.

   What is the threshold voltage for a silicon BJT in forward bias?

   • 0.2V
   • 0.7V
   • 1.2V

   Hint

   Think about standard diode behavior.

4. 4.

   True or False: The saturation region of a BJT allows for maximum current flow.

   • True
   • False

   Hint

   Consider what happens when both junctions are on.

5. 5.

   Design a circuit using a BJT that operates in the active region. Explain how you will ensure that it does not move to saturation or cut-off.

   Hint

   Remember to calculate the biasing current.

6. 6.

   Given a transfer characteristics graph, identify the required base current to achieve a certain collector current. Justify the selection.

   Hint

   What patterns do you see in the graph?