48.1. Common Collector and Common Drain Amplifiers (Contd.): Numerical Examples (Part B)

Try these first

1. 1.

   What is the expected voltage gain of a common collector amplifier?

   Hint

   Think about the function of this amplifier.

2. 2.

   Define the role of the operating point in a transistor.

   Hint

   Consider what happens without this point.

3. 3.

   What is the typical voltage gain of a common collector amplifier?

   • Less than 0.5
   • Close to 1
   • More than 5

   Hint

   Think about why we use this configuration.

4. 4.

   True or False: The operating point of a transistor only affects the input characteristics.

   • True
   • False

   Hint

   Consider the influence of steady-state conditions.

5. 5.

   Given a common collector configuration with a supply voltage of 12V, calculate the emitter current if the emitter resistor is 1kΩ and the base current is found to be 20µA.

   Hint

   Start from the known voltage drop.

6. 6.

   If a common drain amplifier has an input capacitance of 1pF and an output impedance of 500Ω, what is its upper cutoff frequency?

   Hint

   Remember the formula for cutoff frequency in RC circuits.