ho27.l24_ota2

ho27.l24_ota2 - OTA Feedback Circuits Feedback Circuits...

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1 OTA Feedback Circuits (Part II) R. Dutton, B. Murmann Stanford University R. Dutton, B. Murmann 1 EE114 (HO #27) Poor Man’s OTA Circuit Two deficiencies – Low loop gain – Inefficient use of transconductance (factor ½) op on o m m r ) r ( R g G 2 2 R. Dutton, B. Murmann 2 EE114 (HO #27) 0 0 R G T m β = tot L m c dB C G β ω ω 3 Low frequency loop gain ( Æ precision) Closed-loop bandwidth
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2 Current Mirror Load R. Dutton, B. Murmann 3 EE114 (HO #27) 2 m m g G m m g G (at low frequencies) Frequency Response of Current Mirror 1 1 imirr mp imirr mp p mp omirr sC g i g sC g i g v g i + = = = First cut analysis, neglecting C gdp R. Dutton, B. Murmann 4 EE114 (HO #27) 3 1 1 1 1 Tp pmirr mirr m p imirr omirr p mp p mp ; p s g C s i i ω ω = + =
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3 Does C gdp Matter? [] Ltot mp p o gdp p mp imirr mp p mp omirr sC g v v ) s ( K ) s ( K sC sC g i g v g i = + = = 1 1 1 R. Dutton, B. Murmann 5 EE114 (HO #27) () Ltot gdp mp gdp p Ltot mp gdp gdp p mp mp imirr omirr C C g C C s
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ho27.l24_ota2 - OTA Feedback Circuits Feedback Circuits...

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