21.6.2. Small Signal Equivalent Circuit

Try these first

1. 1.

   What does the small signal equivalent circuit focus on?

   Hint

   Think about what happens when we ignore DC components.

2. 2.

   Define transconductance.

   Hint

   What happens to the output current when the gate voltage changes?

3. 3.

   What parameter relates the change in input voltage to the output current in a MOSFET?

   • Transconductance
   • Drain Conductance
   • Output Resistance

   Hint

   This concept is crucial in amplifier circuits.

4. 4.

   True or False: The small signal equivalent circuit considers DC components.

   • True
   • False

   Hint

   What do we drop in the small signal analysis?

5. 5.

   Consider a MOSFET with a transconductance of 1.5 mA/V and an input voltage change of 0.4V. Calculate the change in the output current.

   Hint

   Use the transconductance formula.

6. 6.

   How would the introduction of higher-frequency capacitances alter the phase response of a small signal equivalent circuit?

   Hint

   Think about how capacitors behave under AC signals.