S08_Lecture04 - Lecture 4 ECE 324 Electronics II Doug Looze...

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February 8, 2008 Electronics II ©2008 Douglas Looze 1 Lecture 4 ECE 324 Electronics II Doug Looze
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February 8, 2008 Electronics II ©2008 Douglas Looze 2 Announcements Homework 1 available on course website Lab next week Review of lab procedures Partners Office Hours Monday 2:30 - 4:30 PM
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February 8, 2008 Electronics II ©2008 Douglas Looze 3 Last Time Differential mode gains Single ended output 2 m D d g R A = - d m D A g R = Differential output Common mode gains Single ended output 2 D cm ss R A R 2245 - 0 cm A = Differential output
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February 8, 2008 Electronics II ©2008 Douglas Looze 4 Common mode rejection ratio Magnitude of the ratio of amplification of differential mode to common mode Large is desirable CMRR CMRR d cm A A = Single-ended CMRR m ss g R = Differential output CMRR = dB CMRR 20log d cm A A =
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February 8, 2008 Electronics II ©2008 Douglas Looze 5 Non-ideal behavior – Finite output resistance r o 0 D D R r R D – Mismatched R D 2 : D D Q R R + D D R R + ( 29 ( 29 CMRR 2 D D R m ss R g R = – Mismatched g m 2 : m m Q g g + ( 29 ( 29 CMRR 2 m m g m ss g g R = Mismatches reduce CMRR
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February 8, 2008 Electronics II ©2008 Douglas Looze 6 Today Active loads Reading S&S 7.5
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February 8, 2008 Electronics II ©2008 Douglas Looze 7 Active Load Replace drain resistors with current mirror
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S08_Lecture04 - Lecture 4 ECE 324 Electronics II Doug Looze...

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