69.2. CE Amplifier with Active Load

Try these first

1. 1.

   What is a CE amplifier?

   Hint

   Think about the voltage gain characteristics.

2. 2.

   What does β represent in a transistor?

   Hint

   It's the ratio of two currents.

3. 3.

   What is the significance of early voltage in a CE amplifier?

   • It does not affect the performance.
   • It helps maintain stability.
   • It defines the output swing before saturation.

   Hint

   Think about how voltage levels relate to the transistor's active region.

4. 4.

   True or False: Decreasing β will always enhance output stability.

   • True
   • False

   Hint

   Consider the balance between current gain and output reliability.

5. 5.

   Design a CE amplifier that maintains its output voltage despite a 20% decrease in β. Outline your methodology including calculations for resistance values.

   Hint

   Focus on using constant current sources for biasing paired with feedback mechanisms.

6. 6.

   Perform calculations to determine how varying the early voltage from 100V to 200V affects output in a specific amplifier configuration. Assume other parameters remain constant.

   Hint

   Apply the equations given in class and think of real-world impacts on audio signals.