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
Q. Open-circuit and load characteristics of generator? The open-circuit and load characteristics of a separately excited dc generator, along with its schematic diagram of conne

Condition Return Similar to conditional jump and call  instructions there are conditional return  instructions  also  based on various  flags.

You have been asked to help on the design of CDU's new electric vehicle. The vehicle is to be powered by a 96V, 300A battery pack and you need to decide on the maximum length you c

When delivering rated load a 10-kW, 230-V self excited shunt generator has an armature-circuit voltage drop that is 6% of the terminal voltage and a shunt-field current equal to 4%

Explain the Voltage Regulation? The percent of voltage regulation of a generator is defined as the ratio of the change in voltage from no-load to full-load to the full-load vol

Q. Show the Complement Representation?   There are two types of complements for each number system. r's and (r-1)'s complement ex.             decimal

Speed Control of DC Shunt Motor V dc   the output of rectifying circuit which is  applied to the motor field  as shown  in figure  for armature voltage V dc   is controlled by

Q. What do you mean by Noise? In any communication system there are usually two dominant factors that limit the performance of the system: 1. Additive noise, generated by el

(a) Find the Thevenin equivalent of the circuit shown in Figure (a) at the terminals A-B. (b) Determine the impedance that must be connected to the terminals A-B so that it is m

The corners of wedge-shaped block are A(0,0,2), B(0,0,3), C(0,2,3), D(0,2,2), E(-1,2,2) and F(-1,2,3) and the reflection plane goes the Y-axis at 450 between (-X) & (Z) axis. Calcu