28.2.1. Introduction

Try these first

1. 1.

   What are the two biasing schemes for Common Emitter Amplifiers?

   Hint

   Think about the two methods discussed for biasing transistors.

2. 2.

   What is the impact of beta on the stability of a fixed bias circuit?

   Hint

   Consider how variations in transistor performance could affect currents.

3. 3.

   What are the biasing schemes used in CE amplifiers?

   • Self-bias
   • Fixed bias
   • Negative feedback

   Hint

   Recall the types of biasing schemes discussed.

4. 4.

   Is a fixed bias circuit stable under varying beta conditions?

   • True
   • False

   Hint

   Think about how beta affects current.

5. 5.

   Design a fixed bias CE amplifier to achieve a collector current of 3 mA, considering the effects of varying beta.

   Hint

   Use the formula Ic = β * Ib to determine the base current and subsequently find suitable resistor values.

6. 6.

   Compare the performance of fixed bias and cell bias CE amplifiers when subjected to thermal variations affecting beta.

   Hint

   Reflect on the characteristics of each biasing method regarding stability.