COMMON DRAIN AMPLIFIER

• In the Common Drain Amplifier setup, the drain input is connected to AC ground.
• Between the gate and drain terminals is where the input goes, and between the source and drain terminals is where the output is recorded.
• This type of amplifier is called a Common Drain Amplifier because the drain wire is shared by both the input and output sides.

The Common Drain Amplifier has

1.  High Input Impedance
2.  Low Output Impedance
3.  Sub-unity voltage gain

• Source Follower is another name for this type of output because it follows the information coming in.
• As its output impedance is low, it is used as a buffer to drive loads with low output impedance.
• The source follower frequently serves as an output stage when a multistage amplifier is driving a low-impedance load.

IMAGE SOURCE

• The picture shows a common drain amplifier (source follower) with a biassing circuit.

IMAGE SOURCE (THUMBNAIL)