Model-based dummy feature placement for oxide chemical-mechanical polishing manufacturability

Ruiqi Tian, D. F. Wong, Robert Boone

Research output: Contribution to journalArticlepeer-review


Chemical-mechanical polishing (CMP) is an enabling technique used in deep-submicron VLSI manufacturing to achieve uniformity in long range oxide planarization. Post-CMP oxide topography is highly related to local spatial pattern density in layout. To change local pattern density, and thus ensure post-CMP planarization, dummy features are placed in layout. Based on models that accurately describe the relation between local pattern density and post-CMP planarization, a two-step procedure of global density assignment followed by local insertion is proposed to solve the dummy feature placement problem in the fixed-dissection regime with both single-layer and multiple-layer considerations. Two experiments, conducted with real design data, gave excellent results by reducing post-CMP topography variation from 767 angstrom to 152 angstrom in the single-layer formulation and by avoiding cumulative effect in the multiple-layer formulation. The result from single-layer formulation compares very favorably both to the rule-based approach widely used in industry and to the algorithm in [3]. The multiple-layer formulation has no previously published work.

Original languageEnglish (US)
Pages (from-to)667-670
Number of pages4
JournalProceedings - Design Automation Conference
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Hardware and Architecture
  • Control and Systems Engineering


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