44.1.2. Input Capacitance

Try these first

1. 1.

   Define input capacitance.

   Hint

   Think about the components connected to the input of an amplifier.

2. 2.

   What is the primary role of a common collector amplifier?

   Hint

   Consider where the collector terminal is connected.

3. 3.

   What is the primary function of input capacitance in amplifiers?

   • To increase signal strength
   • To filter noise
   • To affect signal response speed
   • To stabilize output

   Hint

   Remember how capacitance behaves in AC signals.

4. 4.

   True or False: The input capacitance is usually high in common collector amplifiers.

   • True
   • False

   Hint

   Consider the impact of amplifier configuration.

5. 5.

   Calculate the overall input capacitance when $C_{gs}$ is 5 pF and $C_{gd}$ is 10 pF in a common emitter amplifier with a gain of 0.8.

   Hint

   Remember to apply Miller's theorem correctly.

6. 6.

   Discuss the practical significance of low input capacitance in RF applications and provide an example.

   Hint

   Look at how signal clarity affects communication technology.