28.2.4. Collector Current Calculation

Try these first

1. 1.

   What is the formula for the base current in a fixed bias CE amplifier?

   Hint

   Consider how the supply voltage interacts with the base-emitter voltage.

2. 2.

   What is beta (β) in transistor circuits?

   Hint

   Think about how it represents the amplifying capability of a transistor.

3. 3.

   What happens to the collector current when beta (β) is increased in a fixed bias circuit?

   • It decreases
   • It remains constant
   • It increases significantly

   Hint

   Think about the relationship between base and collector current.

4. 4.

   True or False: The cell bias configuration is less sensitive to changes in beta than fixed bias.

   • True
   • False

   Hint

   Recall the stability advantage of cell bias.

5. 5.

   Design a CE amplifier using the cell bias technique to achieve a gain of at least 20, considering the beta variations between 100 to 250. Specify all components and their values.

   Hint

   Use the voltage divider rule and Ohm's law to balance components.

6. 6.

   Given a fixed bias configuration, calculate the impact of temperature variation on beta, assuming beta changes from 100 to 50, and analyze the output characteristics.

   Hint

   Visualize the output graph before and after beta decline to understand output distortion.