NLDD與NDD

hyseresis

想請問一下各位:
NLDD與NDD這兩層layer是做什摩用的??
% |' \+ N0 d3 ~5 t& O在layout上要注意什麼?
: R8 J2 _, D4 u2 [如能解答,必定感謝

tcsungeric

NLDD is a N-type lightly doped drain (implant layer) for E-field reduction @drain or source site especially for general submicro process.
0 C# d# \/ ]3 K) W; s  A7 vNDD is a N-type double diffusion drain (implant layer for current technology) for E-field reduction @drain or source site (depend on asymmetric or symmetric device structure) especially for high voltage process. No special layout concern, just follow DRM.