62.2.3. Biasing and Operating Point of MOSFET Transistors

Try these first

1. 1.

   What is the purpose of biasing in a MOSFET?

   Hint

   Think about the operational states of a transistor.

2. 2.

   What is the common source configuration?

   Hint

   Consider the layout of the transistor.

3. 3.

   What is the main purpose of biasing in a MOSFET?

   • To turn it off
   • To keep it in saturation
   • To lower voltage

   Hint

   Consider why a transistor needs a certain voltage level.

4. 4.

   True or False: The common gate configuration has high input impedance.

   • True
   • False

   Hint

   Think about the input and output impedance definitions.

5. 5.

   Given specific resistor values and a threshold voltage, calculate the gate voltage needed for M1 to stay in saturation at a specific current.

   Hint

   Remember Ohm’s law and the voltage divider formula.

6. 6.

   Analyze how varying ambient temperature might affect the biasing configuration and operational efficiency of MOSFETs in a circuit.

   Hint

   Consider the temperature coefficient of the MOSFET parameters.