Question

The field effect transistor has

a) very high input resistance

b) high electrical noise

c) low input resistance

d) low electrical noise

Choose the correct option:

1. a) and d) are correct
2. b) and c) are correct
3. c) and d) are correct
4. a) and b) are correct

Answer 1

Correct Answer - Option 1 : a) and d) are correct

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 their smaller size.
• JFETs are protected from radiation.
• The JFET has a negative temperature coefficient of resistance, so they possess higher Temperature Stability.

 

Hence, Option 1 is correct.

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.