13.4.2. Next Steps in Analog Electronics

Try these first

1. 1.

   What is the definition of threshold voltage?

   Hint

   Remember, it's like the gate's password.

2. 2.

   What region does a MOSFET operate in when V_DS is less than (V_GS - V_th)?

   Hint

   Think of it as behaving like a variable resistor.

3. 3.

   What is the cutoff region?

   Hint

   Think about when the switch is off.

4. 4.

   In which region does the MOSFET act like a constant current source?

   • Triode Region
   • Saturation Region
   • Cutoff Region

   Hint

   Where does the current stop changing much with increasing voltage?

5. 5.

   Consider a scenario where a MOSFET is operating at its threshold voltage with K = 1.2 mA/V² and applying a V_GS just equal to V_th. Determine the drain current I_DS and explain what happens if V_DS is subsequently increased.

   Hint

   Think about operating just at the boundary conditions.

6. 6.

   A p-MOSFET has V_th = -2V, and you apply V_GS = -4V. If V_SD is increased beyond the saturation point, determine what happens to the drain current.

   Hint

   Focus on maintaining the larger negative voltages and their effects.