64.2.1. Bandwidth Extension

Try these first

1. 1.

   Define bandwidth.

   Hint

   Think of how different signals travel through a circuit.

2. 2.

   What does a cascode amplifier do?

   Hint

   Consider its structure and functionality.

3. 3.

   What is the primary function of a cascode amplifier?

   • To reduce noise
   • To increase bandwidth and gain
   • To lower power consumption

   Hint

   Think about what characteristics we want to optimize in an amplifier.

4. 4.

   True or False: The Miller effect decreases the input capacitance in amplifiers.

   • True
   • False

   Hint

   Review how gain affects capacitance.

5. 5.

   Using a cascode amplifier design with a given transistor configuration, calculate the expected gain and input capacitance when switching the load resistance from 5 kΩ to 50 kΩ.

   Hint

   Use the relationship that gain = voltage output per voltage input.

6. 6.

   Design a scenario where the cascode amplifier's performance is critically beneficial over a regular CE amplifier in a high-frequency RF application.

   Hint

   Consider factors like output resistance, frequency response, and bandwidth.