34.1.9. Output Resistance and Input Resistance

Try these first

1. 1.

   What is the importance of input resistance in a common source amplifier?

   Hint

   Think about the relationship with previous stages.

2. 2.

   Define output resistance in the context of an amplifier.

   Hint

   Consider what happens at the output of the amplifier.

3. 3.

   What does the input resistance prevent in amplifier circuits?

   • Loading effects
   • Power loss
   • Signal distortion

   Hint

   Think about the impact on signal integrity.

4. 4.

   True or False: Higher output resistance is always desirable in amplifiers.

   • True
   • False

   Hint

   Reflect on how it affects output voltage.

5. 5.

   Design a common-source amplifier with the following specifications: Use VDD = 15V, target IDS = 2mA, and Vth = 2V. What resistors R1 and R2 will you choose if you want VGS at 4V?

   Hint

   Use KVL for voltage drop calculations.

6. 6.

   If we want to increase the gain of our amplifier while maintaining the same VDD and maximum swing, what design changes would you implement?

   Hint

   Analyze the relationships between R_D, IDS, and gain.