49.1.2. Motivation for Common Base and Common Gate Amplifiers

Try these first

1. 1.

   What is a common base amplifier used for?

   Hint

   Think of the role of the base in a BJT.

2. 2.

   Define loading effect in amplifier circuits.

   Hint

   Consider how stages interact with each other.

3. 3.

   What is the main advantage of using a common base amplifier?

   • High voltage gain
   • High current gain
   • Low input impedance

   Hint

   Think about the signal type they handle.

4. 4.

   Biasing is important for ensuring what aspect of transistor operation?

   • Cutoff prevention
   • Maximum power dissipation
   • Low input impedance

   Hint

   Consider the consequences of improper biasing.

5. 5.

   Design a biasing circuit for a common base amplifier that operates within a specified DC voltage range and ensures stable operation for AC signals.

   Hint

   Consider Thevenin's theorem for the biasing network.

6. 6.

   Evaluate the impact of varying input source resistance on the performance of a common gate amplifier.

   Hint

   Use Ohm's law in your evaluation.