Explain the Differentiate Between FET and BJT ?

Explain the Differentiate between FET and BJT.

S.No

Parameter

                FET

                BJT

1.

Full Form

FET Stands for Field Effect Transistor.

BJT Stands for Bipolar Junction Transistor

2.

Input Impedance

Its input impedance is very high.

Its input impedance is high.

3.

Controlled Device

It is a Current controlled device.

It is a Voltage controlled device.

4.

Types of Device

It is a Uni-polar device. Because Conduction of current in FET is due to only one type of charge carriers i.e. majority carriers

It is a Bi-polar device Because Conduction of current in BJT involves both charge carriers i.e. majority carriers as well as minority carriers.

5.

Transconductance.

Low Transconductance.

High Transconductance.

6.

Voltage Gain

Low voltage gain.

High voltage gain.

7.

Noise

Noise is Lower as compared to BJT.

Noise is higher as compared to FET. Because charge carriers have to cross two PN junctions.

8.

Thermal Stability

Higher thermal stability.

Low thermal stability.

9.

Transfer characteristics.

Non Linear transfer characteristics.

Linear transfer characteristics.

10.

Size

Smaller size as compared to BJT.

Larger size as compared to FET.

11.

Gain-Bandwidth product.

Small gain-bandwidth product.

Large gain-bandwidth product.

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