S08_Lecture06 - Lecture 6 ECE 324 Electronics II Doug Looze...

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February 13, 2008 Electronics II ©2008 Douglas Looze 1 Lecture 6 ECE 324 Electronics II Doug Looze
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February 13, 2008 Electronics II ©2008 Douglas Looze 2 Announcements Homework 1 available on course website Due Friday Project 1 available on course website
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February 13, 2008 Electronics II ©2008 Douglas Looze 3 Last Time Review frequency response CS amplifiers
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February 13, 2008 Electronics II ©2008 Douglas Looze 4 Small signal model ( 29 1 eq gd m L C C g R q = + Miller effect Approximation: gd m gs I g V << o m L gs V g R V q 2245 -
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February 13, 2008 Electronics II ©2008 Douglas Looze 5 Today Frequency response of differential amps Reading S&S 7.6 (see also S&S 6.6)
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February 13, 2008 Electronics II ©2008 Douglas Looze 6 Resistively Loaded MOS Amp Differential pair circuit MOSFET of current shown explicitly Impedance SS SS SS Z R C = Gains Differential mode Common mode CMRR ( 29 d A j ϖ ( 29 cm A j ( 29 CMRR j
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February 13, 2008 Electronics II ©2008 Douglas Looze 7 Differential gain Half circuit HF response dominated by internal capacitances ( 29 1 2 1 m D d H g R A j j ϖ = - +
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February 13, 2008 Electronics II ©2008 Douglas Looze 8 Common mode gain Half circuit HF response dominated by source capacitance Gain ( 29 2 2 D cm SS SS R A j R j C ϖ = - ( 29 1 2 D SS SS SS R j R C R = - +
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February 13, 2008 Electronics II ©2008 Douglas Looze 9 Common mode gain (cont.) Example 25 k 0.4 pF SS SS R C = = ( 29 ( 29 1 15.9 MHz 2 25 kW 0.0004 nF Z f π = = 291 MHz H f =
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February 13, 2008 Electronics II ©2008 Douglas Looze 10 CMRR ( 29 ( 29 ( 29 CMRR d cm A j j A j ϖ =
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S08_Lecture06 - Lecture 6 ECE 324 Electronics II Doug Looze...

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