keble
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Vivek, there's a useful book "Analogue-Digital ASICs" Ed R S Soin et al, published by Peregrinus (UK) 1991 ISBN 0 86341 259 9 This has a chapter on layout (chapter name is "Practical aspects of mixed analogue-digital design"). This discusses process variations, noise etc.
I've used the recommendations for many years with success, particularly for common centroid schemes, MOS switches and switched capacitors.
It has a really good example of DAC resistor ladder layout. If you'd like a pdf just send me a message.
- Rob
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