10.4. Operating Principle

Try these first

1. 1.

   What does MOSFET stand for?

   Hint

   Think about the materials involved in this type of transistor.

2. 2.

   What is created when a positive voltage is applied to the gate of a p-type MOSFET?

   Hint

   This region is where mobile charge carriers are absent.

3. 3.

   What happens when a positive voltage is applied to the gate of a p-type MOSFET?

   • Holes are attracted
   • Electrons are repelled
   • A depletion region is formed

   Hint

   Consider how positive voltage interacts with the majority carriers.

4. 4.

   True or False: The threshold voltage is the maximum voltage at which the channel remains conductive.

   • True
   • False

   Hint

   Think about what threshold means in general.

5. 5.

   Given a p-type MOSFET with a threshold voltage of 1V, describe what happens at 0.5V, 1V, and 2V gate voltages in terms of charge carriers and current flow.

   Hint

   Analyze how the channel characteristics change with each voltage.

6. 6.

   Explain how the increase in drain-source voltage affects the operation of an n-MOSFET already in the conductive state.

   Hint

   Focus on the interrelation between gate voltage, channel conductivity, and current.