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
For carry Flag JC (  jump on  Carry ) and JNC (Jump  on No carry ) Instructions : JC transfer the  execution of the  program to the  specified memory  address if  carry

Addition of trivalent impurity to a semiconductor creates many (A) Holes. (B) Free electrons. (C) Valance electrons. (D) Bound electrons. Ans: Addition o

Q. Consider a series-carry synchronous counter with T flip-flops shown in Figure in which the AND gates carry forward the transitions of the flip-flops, thereby improving the speed

(a) Find v out in the circuit shown in Figure. (b) With V i = 2V, R 1 = R 2 = 2.5k, R 3 = 5k, and A = 100, find v out .

Q. What do you mean by addressing and numbering? Numbering and Addressing: In data and telephone networks, end equipment are more often single units than multiple devices uni

Q. Define amplification factor? Amplification factor  μ It is the ratio of the drain -source voltage (ΔVDS) to the change in the gate to source voltage (ΔV GS ) at constan


Problem: Jyoti Textile is considering whether to add a new product to its range. Machinery costing $280,000 would have to be bought at the start of the project (Year 0). The pr

Explain numeric processor 8087. Numeric processor 8087 is a coprocessor which has been intended to work under the control of the processor 8086 and offer it additional numeric

Explain hall affect and derive the mathematical expression for hall coefficient, also describe its applications. Sol. Hall effect If a metal or semiconductor material carr