Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics 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.

What is the difference between JFET and MOSFET?

Status
Not open for further replies.

pavanvkulkarni

Newbie level 4
Joined
Mar 9, 2006
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,348
JFET vs MOSFET

Hi all,
I actually have 2 queries though they may sound very naive.... i posted this in hope of getting a very clear picture

1) What is the difference between JFET and MOSFET in a very very basic sense... And when MOSFET has so many advantages, do we really have to use JFET..?

2) We know that the clock source in most cases is a "crystal"... How does this crystal actually generate the clock... ?? What type of crystals are actually used??
 

pthoppay

Member level 5
Joined
Nov 6, 2005
Messages
80
Helped
6
Reputation
12
Reaction score
2
Trophy points
1,288
Activity points
2,122
Re: JFET vs MOSFET

1) What is the difference between JFET and MOSFET in a very very basic sense... And when MOSFET has so many advantages, do we really have to use JFET..?


No, presently I have never seen anyone using JFET, it is mostly extinct.


2) We know that the clock source in most cases is a "crystal"... How does this crystal actually generate the clock... ?? What type of crystals are actually used??

Because, crystal reference clock are very stable, they work on the principle of piezoelectric effect, the crystal are made up of quartz till 20-32 MHz, overwhich they operate in overtones (not in digital circuits).

Regards,
Prakash.
 

sec

Advanced Member level 4
Joined
Aug 8, 2006
Messages
109
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
Canada,QC
Activity points
2,024
Re: JFET vs MOSFET

JFET as I know is a variable resistor
the MOSFET create a field that attract the electron on the the zone between drain and source so the signal is better when tere is current in the gate. It also got "memory" because on the inductance and capacitor effect
 

gte582w

Member level 5
Joined
Aug 31, 2006
Messages
94
Helped
7
Reputation
14
Reaction score
0
Trophy points
1,286
Activity points
1,700
Re: JFET vs MOSFET

1. JFET is very good for low-noise application

2. the equivalent electrical model for crystal is some combination of
L's and C's, it can be embedded in positive feedback active circuit
(used to compensate the loss) to generate a stable oscillation frequency,
such as colplitts etc.
 

Verba

Member level 5
Joined
Apr 11, 2003
Messages
93
Helped
7
Reputation
14
Reaction score
0
Trophy points
1,286
Activity points
491
JFET vs MOSFET

JFET is good for low noise applications, for low capacitance and high resistance input.
 

bunalmis

Full Member level 5
Joined
Jan 3, 2003
Messages
268
Helped
19
Reputation
38
Reaction score
11
Trophy points
1,298
Location
Ireland
Activity points
2,147
Re: JFET vs MOSFET

JFET has low GS resistance. (GS has junction)
MOSFET high GS resistance (GS no junction)

JFET for small voltage and current applications. (Usually you can not find power JFET at the market)

MOSFET has reverse body diode. JFET hasn't.
 

Gundam001

Full Member level 1
Joined
Apr 8, 2006
Messages
98
Helped
7
Reputation
14
Reaction score
3
Trophy points
1,288
Activity points
1,822
Re: JFET vs MOSFET

Try to read this articles..

MOSFET
Code:
http://en.wikipedia.org/wiki/MOSFET

JFET
Code:
http://en.wikipedia.org/wiki/JFET

Crystal
Code:
http://en.wikipedia.org/wiki/Crystal_oscillator
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top