Stress Aware Layout Optimization Leveraging Active Area Dependent Mobility Enhancement

Minimum implant area-aware gate sizing and placement

“…Kahng et al [9] combine detailed placement and active-layer fill insertion to exploit STI stress for performance improvement. Chakraborty et al [2] propose an active area sizing aware cell-level delay model which forms the basis of linear programming to achieve either maximum performance, or target performance under a resource budget. Li et al [13] present a methodology to determine optimal STI well width; using geometric programming, they also solve a STI stress aware placement optimization formulation.…”

“…(1) We do not consider violations that occur inside of a cell; individual cells are assumed correct by construction. (2) We assume that the minimum width of an implant region inside a cell is always the same as the cell width.…”

“…We first try to move neighbor cells (Line 17). 2 Then, downsizing of neighbor cells (Line 21) can be tried if those cells are not timingcritical. Note that these steps can be performed in a different order -e.g., downsizing of neighbor cells can be performed before moving cells.…”

“…In a similar way, V tswapping of neighbor cells is tried. MoveNCell(c) moves neighbor 2 We do not need to try moving the target cell (Figure 4(e)) as this case could have be fixed at the filler cell insertion stage. cells to create additional space.…”