Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

What are the differences between p and n type mosfets?

Status
Not open for further replies.

zhi_yi

Full Member level 4
Joined
Feb 2, 2005
Messages
196
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
2,548
hi there, is there any good tutorials to learn about mosfets? mosfet are divided into p type mosfet and n type mosfet? what is the differences between p and n type mosfet with the depletion type and enhancement type mosfet?

thank you
 

eecs4ever

Full Member level 3
Joined
Jan 31, 2006
Messages
179
Helped
28
Reputation
56
Reaction score
10
Trophy points
1,298
Location
Analog Environment
Activity points
2,852
n type mosfet

Some one acutally started a post regarding mosfet on the analog circuits board:

https://www.edaboard.com/ftopic151694.html

A lot of useful information posted there.

It would be really good if you read this first:
http://en.wikipedia.org/wiki/Mosfet

To answer your question,
n type mosfet, which is usually called nmos,
lies on a P type substrate. When its turned on,
the conducting channel if formed by an inversion layer of electrons, which connects 2 n-type places.

p type mosfet, is called pmos. It lies on N type substrate. When its turned on, the conducting channel is formed by "holes". and it connects 2 p-type places.

The depletion region is formed between the n and p type. http://en.wikipedia.org/wiki/Depletion_region

Hope that helps.
 

layout_designer

Member level 5
Joined
Jan 9, 2006
Messages
87
Helped
14
Reputation
28
Reaction score
6
Trophy points
1,288
Activity points
1,869
difference between n-type and p-type mosfet

the following doc gives basic understanding.

u get lot of info on net search google.
 

electronics_kumar

Advanced Member level 2
Joined
Nov 29, 2004
Messages
659
Helped
34
Reputation
68
Reaction score
9
Trophy points
1,298
Location
Tamilnadu
Activity points
5,552
n-type mosfet

n-mosfet is most frequently used than p mosfet since former is having high mobility which leads to several advantages
 

maharshi_qis

Full Member level 5
Joined
Feb 14, 2007
Messages
241
Helped
13
Reputation
26
Reaction score
6
Trophy points
1,298
Activity points
2,462
p-mosfet wiki

Pmos as name indicates uses holes as carries for operation and we need to apply -ve voltage so that holes will attract and form a layer for conduction..so its Vt is -ve..........for NMOS we will apply +ve volt and carriers are electrons...
 

wiztronix

Full Member level 2
Joined
Mar 22, 2006
Messages
125
Helped
8
Reputation
16
Reaction score
4
Trophy points
1,298
Location
INDIA
Activity points
2,025
mosfet wiki

the book microelectronics by sedra and smith gives and excellent comparative analysis between these devices..

you'll develop a hight level of clarity if you go through that..

regards,
wiztronix
 

Rf engineer

Member level 5
Joined
Jan 16, 2007
Messages
84
Helped
8
Reputation
16
Reaction score
5
Trophy points
1,288
Activity points
1,824
difference between n-type and p-type mosfets

you may consult following book

electronics devices and circuit theory
by
bolysted...

In chapter 6...u will find very easy to understand text on FET's..

hope that answers the question
 

Rf engineer

Member level 5
Joined
Jan 16, 2007
Messages
84
Helped
8
Reputation
16
Reaction score
5
Trophy points
1,288
Activity points
1,824
p mosfet wiki

p typr mosfets have n channel and n ype have p channel in them
basic diff is the applied voltage levels.

i suggest u to better consult electronic devices and circuit theory by bolysted.
ch 6
u will find answer to all yr questions

regards
ali
 

srieda

Full Member level 2
Joined
Dec 24, 2006
Messages
147
Helped
20
Reputation
40
Reaction score
3
Trophy points
1,298
Location
India
Activity points
2,111
difference between n mosfet and p mosfet

electronics_kumar said:
n-mosfet is most frequently used than p mosfet since former is having high mobility which leads to several advantages
Not always... In diff-amp circuits, if there is no headroom wrt the available VDD, most of the time it'll be pmos which'll used as input transistors. You can add to it the current mirror circuitry... there you are, more pmos than nmos... :D

Of course, I agree with you in that pmos devices are inherently slower than the nmos counterparts..
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top