17.4. Comparison with BJT Circuits

Try these first

1. 1.

   What does MOSFET stand for?

   Hint

   Think about the components of the name.

2. 2.

   In what region does the MOSFET current remain constant despite changes in voltage?

   Hint

   Recall how the voltage affects current in MOSFETs.

3. 3.

   What does the gain of a MOSFET depend on?

   • Transconductance and load resistance
   • Only load resistance
   • Transconductance alone

   Hint

   Remember the components of the gain formula.

4. 4.

   True or False: MOSFETs operate based on current control.

   • True
   • False

   Hint

   Recall the main principle of how MOSFETs function.

5. 5.

   Given a circuit with Vdd = 15V, Rd = 2kΩ, and K = 5mA/V². If Vth = 1V and Vgs = 5V, find the output voltage, and check the operation region.

   Hint

   Remember to verify the operating condition before finalizing Vout.

6. 6.

   Design a circuit with a MOSFET that can amplify a small AC signal superimposed on DC. Specify component values to achieve a gain of 10.

   Hint

   Use the formula for gain to set your Rd and determine necessary Id.