46.5.1. Input Capacitance Calculation and Effects

Try these first

1. 1.

   Define voltage gain and its significance in amplifiers.

   Hint

   Think of what it tells us about the signal's change.

2. 2.

   What effect does higher input resistance have on an amplifier's operation?

   Hint

   Consider how the source reacts.

3. 3.

   What is the purpose of determining voltage gain in amplifiers?

   • To measure input current
   • To assess signal amplification
   • To calculate resistance

   Hint

   Focus on what changes in the signal.

4. 4.

   True or False: The output resistance of a common collector amplifier is typically high.

   • True
   • False

   Hint

   Think about this in terms of load connections.

5. 5.

   Calculate the total input capacitance for a circuit with capacitances C1 = 5nF, C2 = 10nF, and a voltage gain of 0.85.

   Hint

   Use the Miller effect formula for total input capacitance.

6. 6.

   Explain how varying the collector resistance affects both the input and output resistances of a common collector amplifier and provide an equation to support your explanation.

   Hint

   Consider impedance modeling for both input and outputs.