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Question

Consider the MOS transistor shown in the figure below:

Both transistors M1 and M2 have VTN=0.8 V and μnCox=30μA/V2 . If the value of V0=2.91V, then the ratio of (WL)1(WL)2 is equal to

A
18
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B
None of these
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C
83
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D
149
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Solution

The correct option is C 83
Ans : (a)

Given,VGS2=V0=2.91V
VGS1=52.91=2.09V
ID1=ID2
thus,
μnCox2(WL)1(VGS1VT)2=μnCox2(WL)2(VGS2VT)2
(WL)1(WL)2=(2.910.8)2(2.090.8)2

(WL)1(WL)2=83

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