Major advantages of fet transistors over bjt transistors, Electrical Engineering

Q. What the major advantages FET transistors over BJT transistors?

a. BJT transistor (bipolar junction transistor) is a bipolar device - the prefix bi-revealing that the conduction level is a function of two charge carriers, electrons and holes where as the FET is a unipolar device depending solely on electron or hole conduction.

b. For the FET an electric field is established by the charges present that will control the conduction path of the output circuit without the need for direct contact between the controlling and controlled quantities.

c. FET has high input impedance. This permits high degree of isolation between input and output circuits.

d. FETs are more temperature stable than BJTs.

e. FETs are usually smaller in construction than BJTs, making them particularly useful in integrated-circuit (IC) chips.

f. A FET has a negative temperature coefficient of resistance. This avoids the risk of thermal runaway.

g. Compared to BJT a FET has a longer life period and high efficiency

h. In FET, there are no junctions as in an ordinary transistor. The conduction is through an n-type or p-type semiconductor material. For this reason, noise level in FET is small.

Posted Date: 6/12/2013 1:58:37 AM | Location : United States







Related Discussions:- Major advantages of fet transistors over bjt transistors, Assignment Help, Ask Question on Major advantages of fet transistors over bjt transistors, Get Answer, Expert's Help, Major advantages of fet transistors over bjt transistors Discussions

Write discussion on Major advantages of fet transistors over bjt transistors
Your posts are moderated
Related Questions
Electrical Fundamentals 1. An aircraft company has decided to replace the copper cables to the main aircraft generators onboard it's Boeing 747s with aluminium cables that are


Explain IMUL instructions in 8086 family with example and their effect on flag. IMUL: It is an instruction for multiplication of two signed numbers. This result is a signed

What do you understand by DB assembler directive?   DB (Define Byte): The DB directive explains by a byte-type variable (that is a variable that occupies one byte of memo

Q. In the magnetic circuit shown in Figure the center leg has the same cross-sectional area as each of the outer legs. The coil has 400 turns. The permeability of iron may be a

The Octal Butters 74LS244 It has  two group  of four  buffer with  no inverted tri state  output ,  controlled by  two active  low  enable lines  (1G and 2G)  as shown in figur

Q. With the help of a npn transistor circuit and wave forms explain the working of an astable multivibrator In astable multivibrator both transistors are coupled to each other

Consider the following mechanical system: a) Write a differential equation that describes the motion for this system. b) Take the Laplace transform of this equation and

Q. A 6.6-kV line feeds two loads connected in parallel. Load A draws 100 kW at 0.6 lagging power factor, and load B absorbs 100 kVA at 0.8 lagging power factor. (a) For the comb

why BETA a current gain parameter of common emitter amplifier is temperature dependent?