59.3. Common Drain Stage Example

Try these first

1. 1.

   What does a common drain stage in an amplifier do?

   Hint

   Think about the function of a follower.

2. 2.

   Define voltage gain.

   Hint

   Ratio gives us the gain.

3. 3.

   What is the role of a common drain stage in amplifiers?

   • Increases voltage gain
   • Buffers voltage
   • Reduces noise

   Hint

   Think about the functionality of the common drain.

4. 4.

   True or False: Cascading a common drain stage will decrease the overall gain.

   • True
   • False

   Hint

   Consider the purpose of such a design.

5. 5.

   Design a circuit that cascades two amplifier stages, ensuring an overall gain of 10 while limiting the upper cutoff frequency to 1 MHz. Provide R and C values.

   Hint

   Remember that cascading can involve trade-offs.

6. 6.

   If the first stage has an upper cutoff frequency of 500 kHz, and the second stage has a cutoff of 1 MHz, what is the overall cutoff frequency when both stages are cascading?

   Hint

   Which stage creates the greater limitation?