63.2. Lecture – 63 Multi-Transistor Amplifiers: Cascode Amplifier (Contd.) – Numerical Example (Part A)

Try these first

1. 1.

   What is a cascode amplifier? Explain its benefits.

   Hint

   Think about how it compares to simpler configurations.

2. 2.

   Calculate the base current I_B for a supply voltage of 12 V and R1 of 570 kΩ.

   Hint

   Don't forget to subtract the V_BE from the supply voltage.

3. 3.

   What is one major advantage of a cascode amplifier over a common emitter amplifier?

   • Higher Gain
   • Lower Complexity
   • Higher Input Capacitance

   Hint

   Think about the design benefits in terms of GC.

4. 4.

   True or False: The Early voltage is an indication of the output resistance of a BJT.

   • True
   • False

   Hint

   Recall its role in transistor functioning.

5. 5.

   Design a cascode amplifier using given parameters, calculate the expected voltage gain, and discuss its advantages compared to a standard CE amplifier.

   Hint

   Analyze the impact of each component on the overall amplification.

6. 6.

   If the supply voltage increases to 15 V, how does that affect the operating points and voltage across the transistors?

   Hint

   Consider changes in biasing and collector current.