52.3. Common Gate Amplifier

Try these first

1. 1.

   What is the main function of a common gate amplifier?

   Hint

   Think about where the input is connected in the circuit.

2. 2.

   Define the term 'biasing' in the context of amplifiers.

   Hint

   It ensures the amplifier operates in the desired region.

3. 3.

   What is the primary characteristic of a common gate amplifier?

   • High input impedance
   • Low input impedance
   • No impedance
   • Undefined impedance

   Hint

   Consider how the input terminal connects to the source.

4. 4.

   True or False: The common gate amplifier has its source as the input terminal.

   • True
   • False

   Hint

   Recall the configuration terminology.

5. 5.

   Design a common gate amplifier with a drain current of 2mA and calculate the required biasing resistances if the drain voltage is set to 10V.

   Hint

   Use Ohm’s Law in conjunction with the gain equations to find necessary resistances.

6. 6.

   If the current gain of your constructed common gate amplifier is measured at 0.95 and the source resistance is increased to 20kΩ, analyze the possible effects on signal fidelity.

   Hint

   Consider how variations in source resistance can affect total gain and input impacts.