16.6.2. Voltage-Dependent Current Source Model

Try these first

1. 1.

   What is the role of V_GS in a MOSFET?

   Hint

   Think about what voltage changes lead to the MOSFET turning on.

2. 2.

   Define the saturation region for a MOSFET.

   Hint

   Consider the conditions required for maximum current flow.

3. 3.

   What controls the current flow in a MOSFET?

   • Voltage across the gate
   • Voltage across the drain
   • Current through the source

   Hint

   Think about what parameters directly impact how the MOSFET operates.

4. 4.

   True or False: The saturation condition for a MOSFET is met when V_DS is less than V_GS - V_th.

   • True
   • False

   Hint

   Review the conditions that define saturation.

5. 5.

   A MOSFET is biased with V_GS at 5V. Given K=0.5 and V_th at 1V, find I_DS when in saturation. Assume V_DS=10V.

   Hint

   Focus on the relationship for I_DS in the saturation region.

6. 6.

   If a common-source amplifier developed an output voltage of 2V with an I_DS of 5mA flowing, what is the drain resistor value?

   Hint

   Connect how voltage drop across the resistor impacts the output voltage.