Nowadays, analog and mixed-signal (AMS) IC designs, mainly found in the frontends of large ICs, are highly dedicated, complex,\nand costly. They form a bottleneck in the communication with the outside world, determine an upper bound in quality, yield,\nand flexibility for the IC, and require a significant part of the power dissipation. Operating very close to physical limits, serious\nboundaries are faced. This paper relates, from a high-level point of view, these boundaries to the Shannon channel capacity and\nshows how the AMS circuitry forms a matching link in transforming the external analog signals, optimized for the communication\nmedium, to the optimal on-chip signal representation, the digital one, for the IC medium. The signals in the AMS part itself are\nconsequently not optimally matched to the IC medium. To further shift the frontiers of AMS design, a matching-driven design\napproach is crucial for AMS. Four levels will be addressed: technology-driven, states-driven, redundancy-driven, and nature-driven\ndesign. This is done based on an analysis of the various classes of AMS signals and their specific properties, seen from the angle of\nredundancy. This generic, but abstract way of looking at the design process will be substantiated with many specific examples.
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