52.3.5. Current Gain of Common Gate Amplifier

Try these first

1. 1.

   What is the typical current gain of a common gate amplifier?

   Hint

   Think about how much input current the amplifier outputs.

2. 2.

   Why is biasing important for amplifiers?

   Hint

   Consider what happens if a transistor does not receive biasing.

3. 3.

   The current gain of a common gate amplifier is usually close to:

   • 0.5
   • 1
   • 1.5

   Hint

   Consider the definitions of current gain.

4. 4.

   True or false: A common gate amplifier has high input impedance.

   • True
   • False

   Hint

   Recall the primary attributes of this amplifier type.

5. 5.

   If the source resistance is increased in a common gate amplifier to 100 kΩ, discuss how this affects the performance in a detailed manner.

   Hint

   Evaluate the interaction of total resistance in the circuit.

6. 6.

   Consider designing a common gate amplifier with specified supply voltage and load resistance. Derive the equations detailing how to calculate the required biasing conditions.

   Hint

   Use known values to form your equations and apply the saturation condition.