28.2. Common Emitter Amplifier (Contd.) Numerical Examples (Part A)

Try these first

1. 1.

   What is the equation for calculating collector current?

   Hint

   Think about how beta interacts with base current.

2. 2.

   Explain why fixed bias amplifiers are sensitive to changes in beta.

   Hint

   Consider the relationship between collector current and beta.

3. 3.

   What happens to the collector current if β increases?

   • Decreases
   • Increases
   • Remains constant

   Hint

   Remember the formula that relates collector current and beta.

4. 4.

   True or False: Cell biasing improves stability in amplifier designs.

   • True
   • False

   Hint

   Think about how feedback can dampen sensitivity to changes.

5. 5.

   Design a common emitter amplifier circuit that remains stable under varying temperatures. What considerations should be made regarding the resistor values?

   Hint

   Think about maintaining consistent current levels across temperature ranges.

6. 6.

   Given a fixed bias amplifier configuration, how would you modify the circuit to improve its performance if beta varies between 100 and 200? Provide a detailed circuit modification.

   Hint

   Look for ways to utilize feedback to stabilize your design.