69.3.2. DC Output Voltage and Small Signal Parameters

Try these first

1. 1.

   What is the primary purpose of a common emitter amplifier?

   Hint

   Think about its role in audio equipment.

2. 2.

   Define Early voltage in context of a transistor.

   Hint

   It's a measure of transistor performance.

3. 3.

   What happens to the DC output voltage when the Early voltage increases?

   • It increases
   • It decreases
   • Remains the same

   Hint

   Think about how the output current behaves.

4. 4.

   True or False: Negative feedback in amplifiers always degrades performance.

   • True
   • False

   Hint

   Recall the role of feedback loops.

5. 5.

   Develop a common emitter amplifier circuit with given parameters (Vcc=15V, R1=2kΩ, transistor β=150) and evaluate its performance under random variations in β and Early voltage. Provide design justification.

   Hint

   Analyze how the resistance values are tailored to ensure consistent performance.

6. 6.

   Given a situation where the Early voltage varies unexpectedly, describe how you would adjust the design of a CE amplifier to counteract such variations.

   Hint

   Think about circuit diagrams illustrating these concepts.