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freqanalysisamplifierpartII

# freqanalysisamplifierpartII -...

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Adaptive Integrated Microsystems Frequency analysis of common source and  differential pair (Chapter 3: section 3.11) ECE 412 Introduction to mixed-signal circuits (Fall 2007) Class website: http://www.egr.msu.edu/classes/ece412/shantanu

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Adaptive Integrated Microsystems Important concepts ) ( s I R out V C ) 1 ( ) ( ) ( RCs s RI s V out + = A current source charging a parallel combination of resistance and capacitance leads to a pole. ) ( 2 s I ) ( s V out dd V ) ( 1 s I 1 r 2 r 2 C 1 C ) ) )( || ( 1 ( )] ( ) ( )[ || ( ) ( 2 1 2 1 1 2 2 1 s C C r r s I s I r r s V out + + - = Topology leads to a pole and a zero. -A -A F C F C A ) 1 ( + F C Miller capacitance
Adaptive Integrated Microsystems Calculating the location of poles and zeros Location of the pole is determined by total resistance and capacitance measured at the node. node node p C R 1 ϖ db C b I in V 1 Q out V dd V gd C gs C x V Does the method always work ? Poles are associated with internal nodes of a circuit. Zeros are associated with paths that can cancel the signal at the output. Location of the zero is calculated by the condition when no current flow into the output load. gd m z C g ϖ

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Adaptive Integrated Microsystems Source follower Previous method is inaccurate if there is a strong coupling between poles. Example of a source follower. b I in V 1 Q out V dd V L C in R b I in V 1 Q out V dd V gd C L C gs C in R Strong coupling between nodes X and Y. X Y Effect of miller-capacitance ?
Adaptive Integrated Microsystems Source follower b I in V 1 Q out V dd V gd C L C gs C in R gs C gs m V g gs V ds r out V in R in V L C gd C X Y s C V V g s C V L out gs m gs gs = + KCL at node Y (ignore drain current) gs

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freqanalysisamplifierpartII -...

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