Lect.6.Intrinsic.Cap

E large gmid l a r g e g m w ith o u t h a v in g la

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Unformatted text preview: ly w a n t fr o m th e M O S F E T – L a r g e g m w ith o u t in v e s tin g m u c h c u r r e n t • I.e. large gm/ID – L a r g e g m w ith o u t h a v in g la r g e Cg s • I.e. large gm/Cgs R. Dutton, B. Murmann EE114/214A 25 gm/ID and gm/Cgs gm 2 = I D VOV gm/I D gm/Cgs g m 3 µVOV = C gs 2 L2 VOV VOV small VOV large gm/ID Large Small gm/Cgs Small Large R. Dutton, B. Murmann EE114/214A 26 P roduc t • In c a s e s w h e r e w e w a n t to g e t th e " b e s t o f b o th w o r ld s " , it is in te r e s tin g to lo o k a t th e p r o d u c t o f o u r tw o fig u r e s o f m e r it g m g m 3µ ! =2 I D C gs L gm/I D gm/I D*gm/Cgs gm/Cgs VOV • W h ile th is r e s u lt lo o k s b o r in g , it s h o w s th a t u s in g s m a lle r c h a n n e l le n g th s im p r o v e s c ir c u it p e r fo r m a n c e – E ith e r o r b o th s p e e d a n d c u r r e n t e ffic ie n c y R. Dutton, B. Murmann EE114/214A 27 S c a lin g Im p a c t • T h a n k s t o " M o o r e 's L a w " f e a t u r e s i z e s a n d t h u s t h e a v a i l a b l e m in im u m c h a n n e l le n g th h a s b e e n s h r in k in g c o n tin u o u s ly – Lmin has decreased roughly 2x every 5 years – Lmin=10µm in 1970, Lmin=45nm in 2007 • F r o m th e a b o v e d is c u s s io n , it is c le a r th a t w e c a n e x p lo it te c h n o lo g y s c a lin g in d iffe r e n t w a y s –...
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This note was uploaded on 02/07/2014 for the course EE 214 taught by Professor Murmann,b during the Fall '04 term at Stanford.

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