A Computer-Aided Design and Synthesis Environment for Analog by Geert Van der Plas

By Geert Van der Plas

A Computer-Aided layout and Synthesis surroundings for Analog built-in Circuits addresses the layout methodologies and CAD instruments which are on hand for the systematic layout and layout automation of analog built-in circuits. complementary methods are mentioned. within the first half the AMGIE analog synthesis method is defined.

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Once again this geometrical decomposition refines the functional decomposition. The latter two decompositions are frequently used in analog design. The examples given did not give rise to conflicts with a functional decomposition. The functional decomposition is the dominant decomposition in analog synthesis tools. This is not always completely understood. When a manually designed analog circuit is inspected, one will often find that the schematics hierarchy (structural decomposition) and layout database (geometrical decomposition) do not coincide and that only at the top-level the functionblock is represented.

2. the library developer or expert user. The AMGIE system relies on libraries for its operation. Library developers provide this information. This category of users has an interface to the libraries (cell and technology) where they can add, modify and remove device, topology and functionblock data. A library developer is a highly trained person: ideally (s)he is an experienced analog designer, who has an extensive understanding of the AMGIE system and its operation. This set of skills is however hard to develop.

Therefore new placement representations have been proposed. Sequence pair [Bala 99] representation and O-Trees [Pang 00] offer the advantage of the slicing structure: a relative placement which can easily be translated to an absolute, dense placement. At the same time they do not require that the layout has to be slice-able, thus extending the range of reachable layout configurations for four or more devices. A last result of recent research is the introduction of direct performance-driven layout.

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