20.1.4. Determining Input to Output Transfer Characteristic

Try these first

1. 1.

   What is the quiescent point (Q-point) in aMOSFET circuit?

   Hint

   Think of where the transistor operates without any signal input.

2. 2.

   Why are MOSFETs considered non-linear?

   Hint

   Consider the transfer characteristic graph shape.

3. 3.

   What is the purpose of using a Q-point in MOSFET circuits?

   • To find current gain
   • To stabilize the operating point
   • To maximize output distortion

   Hint

   Think about where you want a transistor to operate.

4. 4.

   MOSFET transfer characteristics are typically linear.

   • True
   • False

   Hint

   Reflect on transfer characteristic graphs.

5. 5.

   A MOSFET has a transconductance of 6 mA/V², and the threshold voltage is 2V. If V_gs is increased from 4V to 5V while maintaining a load resistor of 1kΩ, calculate the output voltage change across the load.

   Hint

   Make sure to compute the output voltage for both states to find the difference.

6. 6.

   Design a small-signal model for a circuit involving two MOSFETs in a differential amplifier configuration. Consider their individual Q-points and account for their interaction.

   Hint

   Focus on understanding how each MOSFET impacts the circuit while linearizing them about their operating points.