Which type of device is JFET?

Which type of device is JFET? Correct Answer Voltage controlled device

Concept:

• JFET stands for Junction Field Effect Transistor.
• A field effect transistor is a voltage controlled device i.e. the output characteristics of the device are controlled by input voltage. There are two basic types of field effect transistors:

  1. Junction field effect transistor (JFET)

  2. Metal oxide semiconductor field effect transistor (MOSFET)

• A JFET is a three terminal semiconductor device in which current conduction is by one type of carrier i.e. electrons or holes.
• The current conduction is controlled by means of an electric field between the gate and the conducting channel of the device. To control the conduction of current from the source to the drain, the gate voltage must be more negative than the source voltage.
• JEFTs are futher divided into two types that n-channel JEFT and p-channel JEFT. The three leads of a JEFT are labeled source, gate and drain. 

JFET is a three-terminal voltage controlled device. The voltage applied across the gate is used to control the current through the drain.

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The gate to source voltage changes the channel width between two p regions, which ultimately controls the current flowing between drain and source terminals.

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