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In the following fig. ,find drain current of M4 if all the transistors are in saturation

enter image description here

Subject: CMOS VLSI Design

Topic: CMOS analog building blocks

Difficulty: High

1 Answer
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Solution:

we have,

ID2=IRef[(WL)2(WL)1]

Also,ID3=ID2

&ID4=Iout=(WL)4(WL)3ID3

Iout=(WL)4(WL)3(WL)2(WL)1IRef

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