dcanalysisdiffamp

# Dcanalysisdiffamp - ECE412 (Fall2007 Classwebsite:http/www.egr.msu.edu/classes/ece412/shantanu Adaptive Integrated Microsystems Identify all the

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Adaptive Integrated Microsystems Analysis of differential amplifiers 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 Analysis of differential amplifiers - Identify all the current mirrors - Replace current mirrors by non-ideal current sources/sink. - Identify the input stage of the amplifier which will determine the incremental change in current. - Calculate the impedance seen at the output terminal of the amplifier. out m v R G A = Effect of the input stage Effect of the output impedance
Adaptive Integrated Microsystems Analysis of differential amplifiers Quality of current mirror determines gain and the common- mode rejection of an amplifier. Different current mirror topology leads to different amplifier configuration. Input stage transistors determine gain of the amplifier by directly controlling the current through the mirrors. Bias circuitry generates voltages and current necessary for operating current mirrors.

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Adaptive Integrated Microsystems Example 1. 1 Q 2 Q - in V + in V b I 2 s V dd V dd V 3 Q 4 Q out V dd V 5 Q 6 Q dd V dd V b I 7 Q 8 Q 9 Q How many mirrors ? Can you identify the source follower ? Is Q3 and Q4 mirrors ?
Adaptive Integrated Microsystems An Example 1 Q 2 Q - in V + in V b I 2 s V dd V 5 Q 6 Q 1 Q 2 Q - in V + in V b I 2 s V dd V dd V 3 Q 4 Q out V dd V 5 Q 6 Q dd V dd V b I 7 Q 8 Q 9 Q Identify the input stage.

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Adaptive Integrated Microsystems An Example 1 Q 2 Q - in V + in V b I 2 s V dd V dd V 3 Q 4 Q out V dd V 5 Q 6 Q dd V dd V b I 7 Q 8 Q 9 Q 1 Q 2 Q - in V + in V s V b I 2 ds r Replace the mirror by its equivalent circuit.
Adaptive Integrated Microsystems An Example 1 Q 2 Q - in V + in V 1 Q 2 Q - in V + in V b I 2 s V dd V dd V 3 Q 4 Q out V dd V 5 Q 6 Q dd V dd V b I 7 Q 8 Q 9 Q + = in m V g I 2 - = in m V g I 1 Identify the point of symmetry Vs and then split the input stage about the point of symmetry.

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## 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.

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Dcanalysisdiffamp - ECE412 (Fall2007 Classwebsite:http/www.egr.msu.edu/classes/ece412/shantanu Adaptive Integrated Microsystems Identify all the

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