64.1.5. Multi-Transistor Amplifiers: Cascode Amplifier (Contd.)-Numerical Examples

Try these first

1. 1.

   What is the corrected capacitance value for the cascode amplifier?

   Hint

   Refer to the recent discussions of value updates.

2. 2.

   Describe one advantage of a cascode amplifier over a CE amplifier.

   Hint

   Think about what enhancements we’ve discussed.

3. 3.

   What is the corrected capacitance for the cascode setup?

   • 515 pF
   • 1035 pF
   • 1550 pF

   Hint

   Recall the corrected capacitance we just discussed.

4. 4.

   True or False: Increasing the source resistance in a cascode amplifier always increases bandwidth.

   • True
   • False

   Hint

   Reflect on the gain versus bandwidth discussion.

5. 5.

   You have a cascode amplifier with a bias resistor of 4 MΩ and a total effective capacitance of 600 pF. Assess how these values impact the expected bandwidth and suggest solutions to alleviate high resistance impacts.

   Hint

   Revisit your understanding of the relationship between resistance, capacitance, and frequency.

6. 6.

   In a cascode amplifier, if the gain can surge up to a million due to configuration changes, delineate the potential drawbacks on input capacitance and overall bandwidth.

   Hint

   Think about the trade-offs discussed in class regarding gain vs. frequency response.