NLDD與NDD

hyseresis

想請問一下各位:
NLDD與NDD這兩層layer是做什摩用的??
8 s4 g( |  g) K1 b5 `4 E/ T在layout上要注意什麼?
5 [% J$ p$ W$ k: h: k; u/ [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.
; K$ H- ~  R0 ~' B/ }9 |NDD 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.