In the schematic builder the calculates voltages/currents/transient evaluation that we have actually been provided for the electric engineering course, MOSFETs have the parameter "W/L Ratio".

You are watching: W/l ratio

I figured that it was more than likely Width:Length, yet how go that impact the consistent K, and the voltage threshold? i realise the there is not enough information for pure values, however really I"m looking for a formula the relates the variables.

So my question is, what is the relationship in between W/L, K, and also the threshold voltage the the MOSFET?


transistors mosfet
re-publishing
point out
follow
edited Apr 14 "12 at 13:11
Kian
inquiry Apr 14 "12 at 12:01
*

KianKian
15311 gold badge11 silver badge66 bronze badges
$endgroup$
4
include a comment |

3 answer 3


energetic earliest Votes
6
$egingroup$
The K continuous you refer to (more especially $K_n$) is referred to as the conduction parameter that the n-channel device.

$K_n$ is provided by:

$$K_n = frack_n'2cdotfracWL$$

Where

$$k_n' = mu_nC_ox$$

$mu_n$ is the mobility of the electron in the turning back layer and also $C_ox$ is the oxide capacitance every unit area. Follow to Neamen the $k_n'$ parameter is dubbed the "process conduction parameter" and also is taken into consideration to it is in a continuous for a fabrication technology. Therefore the proportion $fracWL$ is the transistor architecture variable.

Neamen go on to say that the design variable is offered to style MOSFETS to produce particular current-voltage attributes in MOSFET circuits.

EDIT:

Yes w refers to width and also L to length. That relates come the geometry of the semiconductor.


re-publishing
mention
follow
edited Apr 14 "12 in ~ 13:03
reply Apr 14 "12 at 12:57
*

KonsalikKonsalik
1,8351111 silver- badges1717 bronze title
$endgroup$
2
add a comment |
3
$egingroup$
Just a few additions to Konsalik"s answer:

$V_T$ (threshold voltage) is not influenced by the W/L ratio of the transistor, together it depends on other parameters, such together the door insulator thickness and dielectric constant; it also depends top top Source-Bulk voltage, in what is referred to as Body effect:

$$ V_TB = V_T_0 + gamma (sqrtV_SB + 2 phi_B - sqrt2phi_B) $$

Just together note: usually in incorporated circuits, together is limited by the modern technology (as tiny as possible) and also the conductivity is increased with enlarge W; in this way, though, likewise the door capacitance is increased, so often it doesn"t bring any type of advantage.


share
mention
follow
answer Apr 14 "12 in ~ 14:11
*

clabacchioclabacchio
13.1k44 gold badges3434 silver badges7979 bronze badges
$endgroup$
5
add a comment |
0
$egingroup$
I perform an experiment to discover the relationship between threshold voltage and W and L separately yet not the proportion of them. And also the an outcome is as shown listed below
*
*
I suppose possibly threshold voltage is pertained to W or l separately yet it is a constant when W and L boost as a consistent ratio.Hope this may be useful.


re-publishing
point out
follow
reply Oct 8 "17 at 10:08
*

Fiona YangFiona Yang
111 bronze argorial
$endgroup$
include a comment |

your Answer


Thanks for contributing solution to electric Engineering stack Exchange!

Please be sure to answer the question. Provide details and share her research!

But avoid

Asking for help, clarification, or responding to other answers.Making statements based upon opinion; earlier them increase with referrals or personal experience.

Use MathJax to format equations. MathJax reference.

To discover more, see our tips on writing great answers.

See more: A Breathtaking Castiglion Del Bosco Wedding, That Will Have


Draft saved
Draft discarded

Sign increase or log in


authorize up using Google
sign up using Facebook
authorize up making use of Email and Password
send

Post together a guest


name
email Required, yet never shown


Post as a guest


surname
email

Required, yet never shown


article Your answer Discard

By click “Post her Answer”, friend agree to our regards to service, privacy policy and cookie plan


Not the answer you're spring for? Browse various other questions tagged transistors mosfet or asking your very own question.


The Overflow Blog
Featured on Meta
connected
2
can the Ids equation of MOSFETs be used to real devices?
3
expertise MOSFET gate qualities
0
derating the MOSFET
3
Why room the size of a floating gate layer in a MOSFET therefore thick?
0
exactly how to simulate a mosfet native a datasheet in ngspice
0
MOSFET drain existing equation vs top top resistance
9
Why is a high worth resistor essential for grounding a MOSFET gate?
1
making use of a MOSFET as a relay in mains-powered circuits
0
use a MOSFET to switch on/off strength supply for a low strength microcontroller
hot Network questions much more hot concerns

concern feed
subscribe to RSS
inquiry feed To subscribe to this RSS feed, copy and also paste this URL into your RSS reader.


*

electrical Engineering
company
ridge Exchange Network
site style / logo design © 2021 stack Exchange Inc; user contributions license is granted under cc by-sa. Rev2021.10.29.40598


Electrical design Stack Exchange works finest with JavaScript enabled
*

your privacy

By clicking “Accept all cookies”, girlfriend agree stack Exchange deserve to store cookies on your machine and disclose information in accordance through our Cookie Policy.