JFET Types

JFETs are two-terminal voltage-controlled devices that have very high input impedance. They come in two types: n-channel and p-channel.

Questions

• What are the two types of JFETs?
• How does an n-channel JFET work?
• How does a p-channel JFET work?
• What is the input impedance of a JFET?

Answers

• The two types of JFETs are n-channel and p-channel.
• An n-channel JFET works by applying a negative voltage to the gate. This voltage creates a depletion region in the channel, which reduces the current flow from drain to source.
• A p-channel JFET works by applying a positive voltage to the gate. This voltage creates a depletion region in the channel, which reduces the current flow from source to drain.
• The input impedance of a JFET is very high. This means that it draws very little or no input current.