KOAN/ANAGRAM II: new tools for device-level analog placement and routing

The authors describe KOAN and ANAGRAM II, new tools for device-level analog placement and routing. Analog layout tools that merely apply known digital macrocell techniques fall short of achieving the density and performance of handcrafted analog cells. KOAN and ANAGRAM II differ from previous approa...

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Bibliographic Details
Published inIEEE journal of solid-state circuits Vol. 26; no. 3; pp. 330 - 342
Main Authors Cohn, J.M., Garrod, D.J., Rutenbar, R.A., Carley, L.R.
Format Journal Article
LanguageEnglish
Published IEEE 01.03.1991
Subjects
Algorithm design and analysis
BiCMOS integrated circuits
Crosstalk
Geometry
Macrocell networks
Merging
Routing
Silicon
Software libraries
Wiring
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Summary:The authors describe KOAN and ANAGRAM II, new tools for device-level analog placement and routing. Analog layout tools that merely apply known digital macrocell techniques fall short of achieving the density and performance of handcrafted analog cells. KOAN and ANAGRAM II differ from previous approaches by using general algorithmic techniques to find critical device-level layout optimizations rather than relying on a large library of fixed-topology module generators. New placement algorithms implemented in KOAN handle complex layout symmetries, dynamic merging and abutment of individual devices, and flexible generation of wells and bulk constants. New routing algorithms implemented in ANAGRAM II handle arbitrary gridless design rules in addition to over-the-device, crosstalk-avoiding, mirror-symmetric, and self-symmetric wiring. Examples of CMOS and BiCMOS analog cell layouts produced by these tools are presented.< >
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0018-9200
1558-173X
DOI:10.1109/4.75012