Lect.6.Intrinsic.Cap

The result will be used frequently in later design

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Unformatted text preview: s EE114/214A av 0 = g m R Be sure you have a good grasp of this derivation. The result will be used frequently in later design-oriented examples--problem sets, project etc. Design “knob” 23 P e r f o r m a n c e C o n s id e r a t io n s ( 2 ) • F o r th e c u r r e n t w e c a n w r ite 2I gm = D ; VOV av 0 = g m R 1 av 0 " ID = ! VOV 2R Specs • Design “knob” O b s e r v a tio n s – L a r g e r V O V m e a n s la r g e r b a n d w id th – U n fo r tu n a te ly la r g e r V O V a ls o r e s u lts in la r g e r ID • P a r t o f y o u r jo b a s a n a n a lo g d e s ig n e r is to c h o o s e V O V s u c h th a t y o u g e t s u ffic ie n t b a n d w id th w h ile u s in g a s little c u r r e n t a s p o s s ib le R. Dutton, B. Murmann EE114/214A 24 P e r f o r m a n c e C o n s id e r a t io n s ( 3 ) • E v e n t h o u g h w e 'v e c o m e t o t h i s o b s e r v a t i o n u s i n g a v e r y s i m p l e e x a m p le , th is tr a d e o ff te n d s to h o ld in g e n e r a l – O f c o u r s e , a d d itio n a l c o n s id e r a tio n s a n d s e c o n d o r d e r d e p e n d e n c ie s w ill fa c to r in a s y o u le a r n m o r e a b o u t a n a lo g circuit design… • T h e r e a s o n s b e h in d th is tr a d e o ff lie in th e fu n d a m e n ta l p r o p e r tie s o f th e tr a n s is to r its e lf • T o s e e th is , th in k a b o u t w h a t w e r e a l...
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