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Physical analog IC design has not been automated to the same degree as digital IC design. This shortfall is primarily rooted in the analog IC design problem itself, which is considerably more complex even for small problem sizes. Significant progress has been made in analog automation in several R&D target areas in recent years. Constraint engineering and generator-based module approaches are among the innovations that have emerged. Our paper will first present a brief review of the state of the art of analog layout automation. We will then introduce active and open research areas and present two visions -a "continuous layout design flow" and a "bottom-up meets top-down design flow" -which could significantly push analog design automation towards its goal of analog synthesis.

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