Jfet operation - junction, Other Engineering

JFET OPERATION

2284_JFET OPERATION.png

Figure shows the operation of a JFET.

The JUGFET has a physical structure that can be represented by the diagram shown in Figure. In Figure, if the N-Type material is connected to a power source, current will flow through it. It can be seen that the power source could be connected either way, the source and drain being interchangeable. The current flow consists of electrons moving through the N-Type semiconductor.

In Figure, a negative potential is applied to the gate regions. The junction between the P-Type and N-Type regions forms a reversed-biased diode, so no current flows. However, an electric filed extends into the N-Type bar from the P-Type regions. This charge forces current carriers (electrons) away from the region, reducing the amount of the N-Type material for conducting between the source and the drain.

If the potential applied to the gate is made sufficiently negative, the electric field will extend across the whole thickness of the N-Type material. Hardly any charge carriers will be available for current flow, and the current available from the drain will drop to a very low value (never to zero, for it is physically impossible for the channel to close completely).

Changes in the voltage applied to the gate will cause corresponding changes in the current flowing between the source and the drain, which makes the operation of the FET very similar to a bipolar transistor.

Posted Date: 9/14/2012 6:56:57 AM | Location : United States







Related Discussions:- Jfet operation - junction, Assignment Help, Ask Question on Jfet operation - junction, Get Answer, Expert's Help, Jfet operation - junction Discussions

Write discussion on Jfet operation - junction
Your posts are moderated
Related Questions
In the Aircraft Performance course, the aircraft was assumed to be in a steady-state (e.g. steady  cruise, climb, turn, glide), with the forces and moments balanced. The subject of

show the practical use of it also descibe it elaborately why it is useful which way we can use it where we use it

Explain different types of intakes of aircraft


What is the status of corporate governance in UAE?

outline five (5) areas where thermodynamics can be applied in materials engineering

What is Absolute Return Fund The absolute return strategies develop returns from active management with small or no underlying market exposure, seeking to achieve positive returns

Logic gates - and gate: Figure shows the symbol that represents 2 input AND gate together with its truth table. This gate will only adopt a 1 state at its output terminal when

Flow at low Mach number and zero incidence about M6 wing Results from FP were obtained corresponding to M ∞ = 0.2 and a = 0 and, as noted, with the input files generated by FP

Question 1 Explain the concept of error function Question 2 Obtain the Fourier transform for the following Single sided exponential signal Gate function Triangula