11_Lecutre

11_Lecutre - EE114 Lecture 11 Lecture 11 Common Drain...

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EE114 Lecture 11 R. Dutton, B. Murmann 1 EE114 (HO #15) Lecture 11 Common Drain Stage (Source Follower) R. Dutton, B. Murmann Stanford University R. Dutton, B. Murmann 2 EE114 (HO #15) Common Drain Stage I B R L V i V DD C L V o v o g m v gs + v gs - C gd +C gb r o C gs C sb +C L R L v i -g mb v o
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EE114 Lecture 11 R. Dutton, B. Murmann 3 EE114 (HO #15) CD Voltage Transfer (1) Ltot Ltot gs m gs m i o R sC sC g sC g v v 1 + + + + = ( ) 0 1 = ! ! ! " " # $ % % + + o i m gs i Ltot gs Ltot o v v g sC v R sC sC v v o g m v gs + v gs - C gd +C gb C gs C Ltot R Ltot v i ( ) Ltot m Ltot gs m gs Ltot m m i o R g C C s g sC R g g v v 1 1 1 1 + + + + ! + = o mb L Ltot sb L Ltot r || g || R R C C C 1 = + = R. Dutton, B. Murmann 4 EE114 (HO #15) Low Frequency Gain Interesting cases – R L →∞ , r o →∞ , g mb =0 • PMOS , source tied to body, ideal current source Ltot m m v R g g a 1 0 + = o mb L Ltot r || g || R R 1 = 1 0 = v a mb m m v g g g a + = 0 – R L →∞ , r o →∞ , g mb 0 • NMOS , ideal current source) (typically 0.8) – r o →∞ , g mb =0, R L finite • PMOS , source tied to body, load resistor L m m v R g g a 1 0 + = I B R L V i V DD C L V o R Ltot =1/g mb V i V DD C L V o Y in
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EE114 Lecture 11 R. Dutton, B. Murmann 5 EE114 (HO #15) High Frequency Gain Three scenarios ( ) p s z s a v v s a v i o v ! ! " = = 1
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11_Lecutre - EE114 Lecture 11 Lecture 11 Common Drain...

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