Lect.6.Intrinsic.Cap

G ad converter for a disk drive want to maximize

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Unformatted text preview: B u i l d f a s t e r c i r c u i t s ( h i g h e r g m/ C g s ) , w h i l e k e e p i n g p o w e r efficiency constant (gm/ID) • E.g. A/D converter for a disk drive - want to maximize bandwidth/throughput – B u i l d m o r e e f f i c i e n t c i r c u i t s ( h i g h e r g m/ I D ) , w h i l e k e e p i n g t h e b a n d w i d t h c o n s t a n t ( g m/ C g s ) • E.g. A/D converter for video signals - bandwidth fixed by a certain standard R. Dutton, B. Murmann EE114/214A 28 A s id e : g m / I D o f a “ R e a l T r a n s is t o r ” • Long channel p r e d ic a tio n ( 2 /V O V ) is fa ir ly c lo s e to “ r e a l d e v ic e ” fo r V O V > 150m V • U n f o r t u n a t e l y g m/ I D d o e s n o t a p p ro a c h infinity for VOV → 0 • L im it V O V > = 1 5 0 m V in E E 1 1 4 /2 1 4 A to a v o id n o n -p h y s ic a l d e s ig n o u tc o m e s More Advanced Classes in Design R. Dutton, B. Murmann EE114/214A 29 A s id e : T r a n s it F r e q u e n c y ( ω T ) • T h e tr a n s it fr e q u e n c y o f a tr a n s is to r h a s " h is to r ic a lly " b e e n d e fin e d a s th e fr e q u e n c y w h e r...
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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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