59.1.4. Lecture – 59

Try these first

1. 1.

   What is the formula for voltage gain in a Common Source Amplifier?

   Hint

   Recall the roles of g_m and the output resistance.

2. 2.

   Define transconductance.

   Hint

   It involves current and voltage changes.

3. 3.

   What is the transconductance of an amplifier essentially measuring?

   • Input voltage variation
   • Output current variation
   • Signal amplification

   Hint

   It relates to current responses in the circuit.

4. 4.

   True or False: Cascading a Common Source with a Common Drain stage will always increase the gain.

   • True
   • False

   Hint

   Think about what properties a CD stage brings.

5. 5.

   Design a multi-stage amplifier combining CS and CD stages with specified gains of 5 and 1 respectively. Calculate the overall gain and the upper cut-off frequency assuming appropriate values for R and C.

   Hint

   Apply knowledge of cascading in amplifier designs.

6. 6.

   Explain the impact of reducing the load capacitance on the upper cut-off frequency in a CS amplifier while maintaining all other components constant.

   Hint

   Use the relationship from the upper cut-off frequency formula.