freqanalysisamplifierpartII

# freqanalysisamplifierpartII -...

This preview shows pages 1–6. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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 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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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 out gd

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 03/01/2010 for the course ECE 412 taught by Professor - during the Fall '08 term at Michigan State University.

### Page1 / 19

freqanalysisamplifierpartII -...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online