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pull down resistor design

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surreyian

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Hello,

Im trying to figure out how to design my pull down resistor using NMOS transistor.
Pull down current is 5uA(max) with at 3V. How should I size the transistor, in order to get 5uA. currently using 2 cascoded NMOS with L(at max) and W (at min).
Please advice on design.
 

alenhan

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use long cannel device
 

dwilliam

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You can use a simple NMOS current sink.
 

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