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

1991; Institute of Electrical and Electronics Engineers; Volume: 26; Issue: 3 Linguagem: Inglês

10.1109/4.75012

1558-173X

John M. Cohn, David J. Garrod, Rob A. Rutenbar, L.R. Carley,

VLSI and Analog Circuit Testing

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. >