17.6.1. Input to Output Transfer Characteristic

Try these first

1. 1.

   What is the threshold voltage of a MOSFET?

   Hint

   Remember the term threshold relates to the 'minimum' needed.

2. 2.

   Define transconductance.

   Hint

   Think about how voltage change affects current in a device.

3. 3.

   What does an increase in gate voltage above threshold voltage do?

   • Decreases output
   • Increases output
   • Has no effect

   Hint

   Consider the relationship between gate and output we discussed.

4. 4.

   True or False: The load line shows the characteristics of the MOSFET.

   • True
   • False

   Hint

   Remember what we discussed about load lines versus I-V characteristics.

5. 5.

   A MOSFET with K=3 mA/V² and a threshold voltage of 1.8V is connected to a 12V supply. If the gate voltage is set to 2.5V, calculate the drain current and determine if the MOSFET is in saturation or not at R=2K.

   Hint

   Make sure to check the voltage drop across the resistor as well!

6. 6.

   Analyze a circuit using an NMOS where the load line intersects with the I-V curve at multiple points—describe the significance of each intersection.

   Hint

   After finding the intersection points, identify their corresponding output voltages.