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By John M. Cohn, David J. Garrod, Visit Amazon's Rob A. Rutenbar Page, search results, Learn about Author Central, Rob A. Rutenbar, , L. Richard Carley

This booklet provides a close precis of analysis on automated format of device-level analog circuits that was once undertaken within the overdue Eighties and early Nineteen Nineties at Carnegie Mellon collage. We specialize in the paintings at the back of the construction of the instruments known as KOAN and ANAGRAM II, which shape a part of the center of the CMU ACACIA analog CAD approach. KOAN is a tool placer for customized analog cells; ANANGRAM II a close zone router for those analog cells. we try to provide the motivations in the back of the structure of those instruments, together with unique dialogue of the sophisticated expertise and circuit issues that needs to be addressed in any winning analog or mixed-signal structure instrument. Our method in organizing the chapters of the e-book has been to give our algo­ rithms as a chain of responses to those very actual and extremely tough analog format difficulties. ultimately, we current a number of examples of effects generated via our algorithms. This learn was once supported partly via the Semiconductor study Corpora­ tion, via the nationwide technological know-how beginning, by means of Harris Semiconductor, and by way of the foreign enterprise Machines company Resident examine software. ultimately, only for the list: John Cohn was once the dressmaker of the KOAN placer; David Garrod used to be the dressmaker of the ANAGRAM II router (and its predeces­ sor, ANAGRAM I). This publication used to be architected via all 4 authors, edited via John Cohn and Rob Rutenbar, and produced in comprehensive shape via John Cohn.

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The first layer provides basic digitalstyle placement functionality, the second layer extends this basic placement model to include topological constraints for device matching and symmetry, and the third layer adds the ability to exploit parasitic saving device geometry sharing. This chapter describes the first functional layer which provides for simple digital-style placement. We begin by explaining the choice of the flat Gellatt-Jepsen style simulated annealing model as the optimization method most appropriate for device-level analog placement.

Chapter 5 describes our basic routing methodology (line-expansion routing) and the details of simple path-finding for two and multi terminal nets in a tiled routing model. The material in this chapter is not specifically aimed at the analog problem. However, the discussion is necessary since this tile-plane line-expansion router forms a basis for future discussion of novel analog-specific functionality. Examples at the conclusion of this chapter illustrate the fact that sequential net embedding frequently fails to completely route densely placed analog cells.

In this case, the opportunity for geometry sharing is lost and the performance and layout density suffer. Alternately, it is sometimes the case that a particular set of devices can be mapped into available module generators in more than one way. 3(a). Several layout systems support module generators for simple two-transistor current mirrors. 3{c). Although the two groupings are electrically similar, there may be significant layout density and net-length implications to choosing one over the other in the context of a larger circuit layout.

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