keble
Junior Member
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Posts: 11
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Just use this: NRD (or NRS) = Ldiff/W where Ldiff is the length of the drain/source diffusion (ie, the dimension from the poly gate edge to the edge of the diffusion) and W is the width of the transistor. This gives an approximate answer - you could get more accurate if you need to by taking into account the sideways diffusion. Rob
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