17.5.2.1. Finding Output Voltage

Try these first

1. 1.

   What is V_out in a common source configuration with V_in = 5V if R_D = 1kΩ?

   Hint

   Remember to consider the operating region of the MOSFET.

2. 2.

   Define transconductance (g_m).

   Hint

   It relates to how effectively the device controls output based on input.

3. 3.

   What does the load resistor (R_D) affect in a MOSFET circuit?

   • Output Voltage
   • Gate Voltage
   • Threshold Voltage

   Hint

   Consider how current flowing through R_D would affect V_out.

4. 4.

   True or False: The gain of a MOSFET circuit is determined by the equation -g_m * R_D.

   • True
   • False

   Hint

   Recall the definition of gain and the parameters involved.

5. 5.

   Design a circuit using a NMOS with specific parameters (V_th = 2V, R_D = 100kΩ) and a V_dd of 12V. Calculate V_out for both saturation and triode regions.

   Hint

   Graphically illustrate the load lines to validate your calculations.

6. 6.

   A specific NMOS has g_m = 5 mA/V and R_D = 10kΩ. Calculate the gain and predict the output if V_in varies from V_th + 1V to V_dd.

   Hint

   Check for any potential changes in operating regions when V_in approaches V_dd.