Question

Consider the following statements related to JFET:

1. Its operation depends on the flow of minority carriers only.

2. It is less noisy than BJT.

3. It has poor thermal stability.

4. It is relatively immune to radiation.

The correct statements are

1. 1, 2, 3 and 4
2. 1 and 2 only
3. 2 and 4 only
4. 3 and 4 only

Answer 1

Correct Answer - Option 3 : 2 and 4 only

There are some important advantages of junction field-effect transistor (JFET):

• The junction field-effect transistor (JFET) is a majority charge carrier device hence it has less noise
• The JFET has a high input impedance
• The JFET is a low power consumption device
• The JFET can be fabricated in a small size area
• JFETs occupy less space in circuits due to its smaller size
• JFETs are protected to radiation
• The JFET has a negative temperature coefficient of resistance, so they possess higher Temperature Stability.

 

The main disadvantage of the junction field-effect transistor (JFET):

• The main disadvantage of the junction field-effect transistor (JFET) is the relatively low gain-bandwidth product.
• The performance of JFET goes down as frequency increases due to feedback by internal capacitance