12.5. Lecture – 12: Revisiting MOSFET (Contd.)

Try these first

1. 1.

   What is the primary difference in the channel type between n-MOSFET and p-MOSFET?

   Hint

   Think about the types of majority carriers in each device.

2. 2.

   Which voltage must be applied to the gate of a p-channel MOSFET to turn it on?

   Hint

   Consider the relationship between the gate and source voltages.

3. 3.

   What happens to the channel in a p-MOSFET when the gate is appropriately biased?

   • Electrons flow from drain to source
   • Holes flow from source to drain
   • No current flows

   Hint

   Think about which carriers are responsible for the current in p-channel devices.

4. 4.

   In a p-MOSFET, higher-drain voltage leads to which effect?

   • True
   • False

   Hint

   Consider what a 'pinch-off' means in terms of channel behavior.

5. 5.

   Design a simple circuit that includes both an n-channel and a p-channel MOSFET. Explain how to bias each and ensure they work together.

   Hint

   Consider how to control the timing of both MOSFETs for desired operation.

6. 6.

   Given a p-MOSFET with a threshold voltage of -2V, if you apply -5V to the gate with respect to the source, predict the behavior and current flow.

   Hint

   Visualize the voltage drops and flow of holes when sufficiently biased.