13.1.1. Introduction

Try these first

1. 1.

   What is the threshold voltage in a MOSFET?

   Hint

   Think of it as a 'turning on' voltage.

2. 2.

   In what region does the MOSFET act like a resistor?

   Hint

   Remember, TRI - the start of TRIode means it behaves like a resistor!

3. 3.

   What happens when the gate-source voltage (VSG) is less than the threshold voltage (Vth)?

   • Current increases
   • Current is zero
   • Device enters saturation

   Hint

   Think how a gate reacts when not powered.

4. 4.

   In which region does a MOSFET primarily exhibit linear behavior?

   • True
   • False

   Hint

   Key phrase: TRIode means linear.

5. 5.

   Given a MOSFET with a Y parameter and a threshold voltage, calculate the threshold current when VGS is increased to a specific level. What fraction of increase does this reflect in terms of resistance across the channel?

   Hint

   Consider how increasing voltage influences resistance.

6. 6.

   If a MOSFET is subjected to a constant channel length modulation effect, describe how changing ambient temperature can affect the stability of the output current.

   Hint

   Temperature's role can alter performance—think of how it changes mechanics.