7.5. Modes of Operation

Try these first

1. 1.

   What mode of operation is a BJT in when it amplifies signals?

   Hint

   Think about the term that stands for amplification.

2. 2.

   In which mode is the BJT turned off?

   Hint

   Consider which mode prevents current from flowing.

3. 3.

   What operational mode allows BJTs to amplify signals?

   • Cut-off
   • Active
   • Saturation
   • Inverse Active

   Hint

   Think of amplification.

4. 4.

   In which mode does the BJT operate as a switch?

   • Active
   • Cut-off
   • Saturation
   • Inverse Active

   Hint

   Consider the maximum current flow.

5. 5.

   A BJT is used in a circuit where it needs to switch loads on and off quickly. Discuss which mode of operation is most suitable and explain why.

   Hint

   Consider the behavior of a switch.

6. 6.

   In a specific application, losses during switching are significant if the BJT is not managed correctly. How can addressing the cut-off and saturation modes influence efficiency?

   Hint

   Focus on the on/off cycle of the transistor.