43.2.2. Frequency Response of Common Emitter and Common Source Amplifier

Try these first

1. 1.

   What is a common emitter amplifier?

   Hint

   Think about the emitter's role in the circuit.

2. 2.

   How does cascading affect amplifier performance?

   Hint

   Consider what happens when components are directly connected.

3. 3.

   What is the expected total gain when cascading two amplifiers?

   • The product of their gains
   • Sum of their gains
   • Gain equals one

   Hint

   Think of how each amplifier influences the next.

4. 4.

   True or False: The addition of a buffer always increases the gain of the circuit.

   • True
   • False

   Hint

   Focus on the purpose of buffers in circuits.

5. 5.

   If two common emitter amplifiers have gains of 12 and 8 with an input capacitance of 10nF for the second stage, calculate the overall gain assuming an attenuation of 0.5 due to loading.

   Hint

   Use the product of gains and apply the attenuation factor.

6. 6.

   Discuss in detail how one might design an improved cascading system for amplifiers seeking to maintain bandwidth while maximizing gain.

   Hint

   Consider the roles of input and output capacitance in your designs.