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
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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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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.
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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
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reply Oct 8 "17 at 10:08
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