By Ricardo Martins, Nuno Lourenço, Nuno Horta
This e-book introduces readers to various instruments for analog structure layout automation. After discussing the location and routing challenge in digital layout automation (EDA), the authors evaluation a number of computerized structure iteration instruments, in addition to the newest advances in analog layout-aware circuit sizing. The dialogue contains diversified equipment for automated placement (a template-based Placer and an optimization-based Placer), a fully-automatic Router and an empirical-based Parasitic Extractor. The innovations and algorithms of all of the modules are completely defined, allowing readers to breed the methodologies, enhance the standard in their designs, or use them as start line for a brand new device. the entire equipment defined are utilized to useful examples for a 130nm layout procedure, in addition to placement and routing benchmark sets.
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Additional resources for Analog Integrated Circuit Design Automation: Placement, Routing and Parasitic Extraction Techniques
7] and ALDAC . However, these methods are usually slow and not always produce optimal solutions in terms of area and performance. In  the sequence-pair representation is used together with a SA-based kernel to perform an analog-based routability-driven adjustment during the placement process. 1. 2 Classification of analog tools based on generation techniques Tools Procedural ALSYN , Jingnan  Advantages (+) Fast processing; Drawbacks (−) Limited flexibility for specifications’ change; (−) Technology migrations force complete cells redesign; (−) High cost of generating the procedural cell.
2 Floorplan Representations One of the most relevant factors when developing a placement tool is its representation of the cells and each placement tool has its own strategy for it. , encoding the positioning relations between any pair of cells, the last one is further classified into slicing or non-slicing representations. , the manufacturing grid, in this way, every possible placement can be described. It proved to be the most practical solution to implement topological constraints since they can be minimized or forced using the coordinates directly.
These tools beyond their flexibility in terms of incremental adding new functionalities, are easier to implement when compared to procedural and template-based . In the area of device-level placement with layout constraints there are some references of special relevance for this review. ILAC  uses SA operating over a topological slicing tree, used to limit the search space. 2, representing the cells by means of absolute coordinates proved to be the most practical solution to implement layout constraints, even though it allows for an infinitely large solution space.