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The main problems of layout for analog/mixed signal IC's are device matching and unwanted parasitics reduction.Generally speaking the principle of mixed signal layout is noise reduction(offset can be treated as a sort of noise)As previously told the techniques for matching are common centroid...
The layout techniques to be followed are
firstly ,find out which are the blocks that require matching(either common centroid or interdigitized) , also try fingering if possible
secondly ,if the analog block has to be protected from the surrounding blocks provide guardrings .
shield the signals...
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