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?

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edited Apr 14 "12 at 13:11
Kian
inquiry Apr 14 "12 at 12:01

KianKian
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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.

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edited Apr 14 "12 in ~ 13:03
reply Apr 14 "12 at 12:57

KonsalikKonsalik
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$V_T$ (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.

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answer Apr 14 "12 in ~ 14:11

clabacchioclabacchio
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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.

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reply Oct 8 "17 at 10:08

Fiona YangFiona Yang
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