44.3.2. Effect of Cascading on Signal

Try these first

1. 1.

   What happens when two common emitter amplifiers are cascaded?

   Hint

   Think about the input and output resistances.

2. 2.

   Why do we use buffer circuits?

   Hint

   Consider the interaction between two amplifier stages.

3. 3.

   What is a common collector configuration?

   • A MOSFET configuration
   • A BJT configuration
   • An operational amplifier configuration

   Hint

   Remember the device type associated with each configuration.

4. 4.

   True or False: A common drain configuration has a voltage gain significantly less than one.

   • True
   • False

   Hint

   Think about the properties of a buffer.

5. 5.

   Design a circuit using a common collector amplifier as a buffer between two cascaded common emitter amplifiers and analyze its effect on voltage gain.

   Hint

   Consider the input-output relationship and resistances involved.

6. 6.

   Analyze a given circuit with a common drain MOSFET configuration and derive the expressions for voltage gain and output resistance.

   Hint

   Utilize the small signal model effectively.