In integrated circuit design, integrated circuit (IC) layout, also known IC mask layout or mask design, is the representation of an integrated circuit in terms of planar geometric shapes which correspond to the patterns of metal, oxide, or semiconductor layers that make up the components of the integrated circuit. Originally the overall process was called tapeout, as historically early ICs used graphical black crepe tape on mylar media for photo imaging (erroneously believed to reference magnetic dataâthe photo process greatly predated magnetic media).
When using a standard processâwhere the interaction of the many chemical, thermal, and photographic variables is known and carefully controlledâthe behaviour of the final integrated circuit depends largely on the positions and interconnections of the geometric shapes. Using a computer-aided layout tool, the layout engineerâor layout technicianâplaces and connects all of the components that make up the chip such that they meet certain criteriaâtypically: performance, size, density, and manufacturability. This practice is often subdivided between two primary layout disciplines: analog and digital.