Depletion type mosfet, Electrical Engineering

Depletion type MOSFET

The channel is of silicon. It can be two type of channel that is an n-type or p-type channel; it is still mostly silicon. After that, we take note that silicon dioxide is simply glass that is a good insulator. Thus we can form a thin layer of silicon dioxide together one surface of the channel, and then lay our metal gate region down over the glass. The result is displayed in the figure.

140_Depletion type MOSFET 1.png

Sometimes this device is termed as an insulated-gate field effect transistor, or IGFET. More generally, noting the construction of the gate, it is termed as a metal-oxide-semiconductor FET, or MOSFET.

Without voltage applied to the gate (G) electrode, the channel really is only a semiconductor resistance, and will conduct current as per to the voltage applied in between source (S) and drain (D). There is no pn junction, thus there is no depletion region.

2352_Depletion type MOSFET 2.png

With a suitable voltage applied in between source and drain, current will flow via the channel, as a semiconductor resistance. Though, if we now apply a negative voltage to the gate, as displayed in figure, it will amount to a small negative static charge on the gate. This negative voltage will repel electrons, along with their negative charge, away from the gate. However, free electrons are the majority current carriers in the n-type silicon channel. Through repelling them away from the gate region, the applied gate voltage makes a depletion region around the gate area, so restricting the usable width of the channel just like the pn junction did. Since this sort of FET operates by creating a depletion region in an existing channel, it is termed as a depletion-mode MOSFET.

Posted Date: 1/11/2013 1:40:06 AM | Location : United States

Related Discussions:- Depletion type mosfet, Assignment Help, Ask Question on Depletion type mosfet, Get Answer, Expert's Help, Depletion type mosfet Discussions

Write discussion on Depletion type mosfet
Your posts are moderated
Related Questions
Give an industrial look at modern CAM/CAD. Define explicit, implicit and parametric representations. What are the basic advantages of parametric representations over the impli

power factor improvement

N-type semiconductor is an example of (A)  Extrinsic semiconductor.            (B) Intrinsic semiconductor. (C)  Super conductor.                        (D)  Insulators.

(a) Some antennas have a physical aperture area A that can be identified and is related to the effective area A e by A e = ρ a A, where ρ a is known as the aperture efficiency.

Q. Internal Frequency Compensation of operational amplifier? Some op amps, such as the 741, have internal RC networks which are intentionally designed to reduce gain at high fr

Q. Sketch the depletion MOSFET drain characteristics The depletion-type MOSFET has a structure similar to that of the enhancement-type MOSFET with one important difference: The

region of convergence of (Z+2)*(12z-1)/((3z-1)*(4z+1 ))

Design combinational-sequential electronic logic gate circuit for a car wash....

Explain the hysteresis loop of a magnetic material. Hystereses loop-Below the Curie temperature all-ferromagnetic materials show the identified hysteresis in the B (i.e. flux

The two sides of a triangle are 17 cm and 28 cm long, and the length of the median drawn to the third side is equal to 19.5 cm. Find the distance from an endpoint of this median to