Power Cell Synthesizer Optimizing On-Resistance and Layout Area

The power cell is divided into multiple unit cells, each with its own intrinsic transistor and metal interconnect structure. This segmentation allows the total on-resistance to be distributed across parallel paths, reducing the overall resistance without proportionally increasing the area of each individual unit cell. The segmented approach enables independent optimization of each unit while achieving system-level performance targets.

The metal interconnect structure is optimized with non-uniform geometry, where the interconnect width varies along its length to compensate for resistance effects. The interconnect is wider at regions where current density is higher and narrower where current density is lower. This local quality variation allows the metal interconnect resistance to be minimized while maintaining a compact cell area, directly addressing the contradiction between area reduction and resistance management.

Closed-form analytical expressions are derived beforehand that directly calculate the optimal power cell parameters (gate width, interconnect dimensions, unit cell count) based on target on-resistance specifications. These pre-derived formulas eliminate the need for iterative simulation and adjustment during the design process. The designer simply inputs the target RDSon value and device voltage rating, and the analytical model immediately provides the optimized geometric parameters, dramatically reducing design time while maintaining high accuracy.