47.4.5. Upper Cutoff Frequency Reevaluation

Try these first

1. 1.

   Define a common collector amplifier.

   Hint

   Think about the function of this amplifier.

2. 2.

   What is transconductance?

   Hint

   It involves collector current and thermal voltage.

3. 3.

   What is the primary function of a common collector amplifier?

   • To amplify power
   • To provide impedance buffering
   • To act as a signal generator

   Hint

   Consider its role in circuit stability.

4. 4.

   True or False: The upper cutoff frequency can be improved by increasing load capacitance.

   • True
   • False

   Hint

   Reflect on how capacitance interacts with frequency.

5. 5.

   Design a common collector amplifier for a specific application requiring a voltage gain of 0.95, input impedance above 1MΩ, and output impedance below 50Ω. Calculate the necessary parameters including resistor values.

   Hint

   Balance gain and resistance values carefully for desired performance.

6. 6.

   Given a circuit with a load capacitance of 150pF and output resistance of 70Ω, recalculate the upper cutoff frequency and discuss its implications on circuit performance.

   Hint

   Analyze shifts in frequency response due to this change.