Discussion
The minimum width of n-diffusion and p-diffusion layer should be :
Answer: B
The minimum width of the n-diffusion and p-diffusion layers is 2λ.
In the Mead-Conway lambda-based design rules, as taught in Pucknell and Eshraghian's Basic VLSI Design, every dimension is a multiple of \(\lambda\), half the minimum feature size. The rules give diffusion (n and p) a minimum width of 2λ, polysilicon a minimum width of 2λ, and first-layer metal a minimum width of 3λ.
So 3λ is the metal 1 rule, not the diffusion rule, 4λ is the rule for second-layer metal, and a single λ is below the minimum width allowed for any layer.
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