63.5. Numerical Problems on Cascode Amplifier using BJT

Try these first

1. 1.

   What is a cascode amplifier?

   Hint

   Think about how transistors are arranged.

2. 2.

   Calculate the collector current if the base current is 20 μA and β is 100.

   Hint

   Use the formula I_C = β * I_B.

3. 3.

   What is the primary advantage of a cascode amplifier?

   • A. Higher gain
   • B. Better bandwidth
   • C. Simplicity

   Hint

   Focus on the benefits of stacking transistors.

4. 4.

   True or False: The voltage gain of a cascode amplifier is generally lower than that of a CE amplifier.

   • True
   • False

   Hint

   Consider the context of RF applications.

5. 5.

   Design a cascode amplifier for given bias conditions and calculate the expected voltage gain.

   Hint

   Be mindful of all circuit elements and their configuration.

6. 6.

   Analyze how changing the early voltage affects the performance of a cascode amplifier using BJTs.

   Hint

   Consider the trade-offs involved with biasing.