Differences in construction of MOSFET and JFET, Physics

Assignment Help:

Differences in Construction of MOSFET and JFET

An N-channel JFET is demonstrated in figure (a). It comprises a thin N-type silicon bar with two islands of P-type semiconductor material embedded in the sides hence forming two PN junctions.  While in N-channel Depletion MOSFET, there  is  just one p-region instead of two. This region is called substrate. Two P-regions are embedded in it as shown in fig. (b)

 

1960_mosfet.png

'

1563_mosfet.png

Since gate is insulated from the channel  by a thin layer of silicon dioxide, input impedance of MOSFET is very high (of the order of 104 to 109M?) while the input impedance of JFET is 100M?as for a reverse biased pn junction.

Unlike JFET, a MOSFET has no gate diode,  it forms a capacitor. Capacitor has  gate  and  channel  as  electrodes  and  oxide  layer  is  dielectric.   Due to this property, device can be operated with negative as well as positive gate voltages.


Related Discussions:- Differences in construction of MOSFET and JFET

Illustrate position-time graph, A jogger runs at a constant rate of 10.0 m ...

A jogger runs at a constant rate of 10.0 m every 2.0 s. The jogger starts at the origin, and runs in the positive direction for 3600.0 s.The figure below is a position-time graph s

Radius of an atom is of the order, The radius of an atom is of the order of...

The radius of an atom is of the order of: (1) 10 -10 cm (2) 10 -13 cm (3) 10 -15 cm (4) 10 -8 cm Ans: (4)10 -8 cm

Compute the mass in atomic mass units, A singly charged positive ion moving...

A singly charged positive ion moving at 4.6 * 10^5 leaves a circular track of radius 7.94 mm along a direction perpendicular to the 1.8 -T magnetic field of the bubble chamber. Com

Edwards-casimir quantum vacuum drive, Edwards-Casimir quantum vacuum drive ...

Edwards-Casimir quantum vacuum drive A hypothetical drive exploiting the peculiarities of quantum mechanics through limiting allowed wavelengths of virtual photons on one side

The area of a plate assuming a two-plate construction, A capacitor is to be...

A capacitor is to be constructed so that its capacitance is 0.2µF and to take a p.d. of 1.25kV across its terminals. The dielectric is to be mica which, after allowing a safet

State the process of diffusion, State the process of diffusion When  th...

State the process of diffusion When  these  two  pieces  are  joined  together and  suitably  treated,  they  from  a  pn junction. Moment they form a pn junction, some of the

Descrieb the types of magnetic material, On the basis of mutual interaction...

On the basis of mutual interactions or behavior of several materials in an external magnetic field, the materials are dividing in three basic categories. (i) Diamagnetic materi

Measurement of wavelength of monochromatic light, Q. Measurement of Wavelen...

Q. Measurement of Wavelength of Monochromatic Light? Monochromatic Light is allowed to fall on plate G 1 . The M.I. is adjusted for circular fringes. For this mirror M 1 is ma

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd