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
what are the disadvantages of superposition theorem?

Q. What is the basic principle of oscillators?  In an oscillating circuit, the amplitude of voltage or current oscillations decays with time owing to the dissipation of energy


Give a few applications of superconductors. Also give three applications of superconductors. Application of superconductors in Electrical and Electronic Engineering (i) The

Ask quA 380-V, 15-hp, 50-Hz, four-pole, Y-connected wound-rotor induction motor has the following impedances in ohms per phase referred to the stator circuit: R1= 0.453? R2= 0.24

Comparison  of Induction and Dielectric Heating After  studying the induction and  dielectric  heating  followings  points  may consider for  comparison  between  induction an

Discuss merits and demerits of Macro over procedures.  The MACRO directive informs assembler the starting of a macro which is used with ENDM directive to enclose a macro. The

This problem is with circuits. It is basic circuit problem. I need a very detailed step by step on how we arrived at the solutions. Only respond if you are 100% sure on your answer

Q. Consider an RL series circuit excited by (a) v(t) = 20e -2t V, and (b) v(t) = 20 V. Determine the forced component of the voltage across the inductor for R = 2  and L = 2H.

How to plot output power Vs load resistor graph using PSpice softwaer for half wave rectifier circuit