12.5.1. Introduction to p-channel MOSFET

Try these first

1. 1.

   What type of charge carriers are used in p-channel MOSFETs?

   Hint

   Recall the charge types: electrons and holes.

2. 2.

   Is the substrate of a p-channel MOSFET usually n-type or p-type?

   Hint

   Consider what type of channel forms above the substrate.

3. 3.

   What is the primary charge carrier in a p-channel MOSFET?

   • Electrons
   • Holes
   • Neutrons

   Hint

   Recall the type of charge carriers in semiconductors.

4. 4.

   True or False: The threshold voltage for u-channel MOSFETs is always positive.

   • True
   • False

   Hint

   Think about how the gate voltage must be set for conduction.

5. 5.

   If a p-channel MOSFET has a threshold voltage of -2V and a gate voltage of -4V applied, what will happen, and what is the implication for circuit design?

   Hint

   Think about whether the voltage applied is lower than the threshold.

6. 6.

   Consider a p-MOSFET in a circuit where the current is measured at 10 mA. If you change the width of the channel to 2 times its original value, what happens to the current?

   Hint

   Think about the relationship between width and current flow.