4. Introduction to MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors)

Try these first

1. 1.

   What is a MOSFET?

   Hint

   Think about the insulation and control mechanism.

2. 2.

   What are the two types of MOSFETs?

   Hint

   One type begins with no channel, the other starts with one.

3. 3.

   What does MOSFET stand for?

   • Metal-Oxide-Semiconductor Field Effect Transistor
   • Metal-Oxide-Semiconductor FET
   • Field Effect Transistor

   Hint

   Remember what each part of the acronym refers to.

4. 4.

   True or False: An E-MOSFET conducts when VGS is less than Vth.

   • True
   • False

   Hint

   Consider the conditions for current flow in E-MOSFET.

5. 5.

   A designer wants to use an E-MOSFET in a circuit. Calculate the drain current if Vth = 2V, VGS = 5V, and k = 0.5 mA/V².

   Hint

   Remember to substitute the values into the saturation equation.

6. 6.

   Explain how the Drain-Source voltage affects conductance in the Triode region for an E-MOSFET.

   Hint

   Think about the interaction between VGS and VDS thresholds.