24_Lecutre

24_Lecutre - EE 114 Lecture 24 R. Dutton, B. Murmann 1...

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Unformatted text preview: EE 114 Lecture 24 R. Dutton, B. Murmann 1 EE114 (HO #28) Lecture 24 OTA Feedback Circuits (Part II) R. Dutton, B. Murmann Stanford University R. Dutton, B. Murmann 2 Poor Man’s OTA Circuit • Two deficiencies – Low loop gain – Inefficient use of transconductance (factor ½ ) EE114 (HO #28) V DD V xm V xp V o V BN V BP I TAIL /2 I TAIL C s C f v o v i R G T m ! = op on o m m r ) r ( R g G 2 2 ! ! tot L m c dB C G ! " # " # $ 3 Low frequency loop gain ( ◊ precision) Closed-loop bandwidth EE 114 Lecture 24 R. Dutton, B. Murmann 3 EE114 (HO #28) Current Mirror Load V DD V xm V xp V o V BN V BP ( ) 0.5g m v xm 0.5v xm 0.5g m v xm (“wasted” ac current) V DD V xm V xp V BN ( ) 0.5g m v xm 0.5v xm 0.5g m v xm 0.5g m v xm V o g m v xm 0.5g m v xm 2 m m g G ! m m g G ! (at low frequencies) R. Dutton, B. Murmann 4 EE114 (HO #28) Frequency Response of Current Mirror i imirr V o i omirr C p =2C gsp +C dbp +C dbn +C gdn C gdp v p 3 1 1 1 1 1 1 Tp pmirr mirr m p imirr omirr p mp imirr mp p mp imirr mp p mp omirr ; p s g C s i i sC...
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This note was uploaded on 11/02/2011 for the course EE 114 taught by Professor Murmann during the Fall '08 term at Stanford.

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24_Lecutre - EE 114 Lecture 24 R. Dutton, B. Murmann 1...

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