33.5. Lecture – 33: Common Source Amplifier (Part B)

Try these first

1. 1.

   What is the formula for calculating voltage gain in a common source amplifier?

   Hint

   Remember it relates gain to transconductance and drain resistance.

2. 2.

   Define input resistance in the context of a common source amplifier.

   Hint

   Think about how resistors combine in parallel.

3. 3.

   What is the formula for voltage gain in a common source amplifier?

   • A = g_m * R_D
   • A = -g_m * R_D
   • A = R_D / g_m

   Hint

   Look for the relationship involving transconductance and resistance.

4. 4.

   True or False: The output resistance of a common source amplifier is always greater than its input resistance.

   • True
   • False

   Hint

   Think about how input and output resistances are defined.

5. 5.

   Design a common source amplifier with a given V_dd and specified R values to achieve a target voltage gain of -10. Calculate the necessary g_m and assess the trade-offs.

   Hint

   Consider the relationship between resistances and transconductance in controlling gain.

6. 6.

   Evaluate how varying R_D affects the output swing in a common source amplifier – derive conditions for maximum output without distortion.

   Hint

   Examine the implications of load line analysis in evaluating output limits.