Efficient Optimization of Decoupling Capacitors using Iterative Inversion Technique

To maintain Power Integrity (PI) in a high-speed electronic system, the Power Delivery Network (PDN) needs to be optimized with respect to its impedance. To minimize power supply noise, decoupling capacitors are used in a PDN. By selecting appropriate decoupling capacitors (decaps) and placing them on optimal locations on board/package, the overall impedance of a power delivery network can be effectively reduced to a desired level to minimize the variationa in supply voltage due to varying load current. In this paper, a time-efficient matrix inversion approach is used for impedance calculation within Particle Swarm Algorithm (PSO) algorithm which helps to enhance the efficiency of the optimization proces. The proposed approach is demonstrated through a practical case study. The applied technique significantly reduces the overall runtime of the algorithm, enhancing computational efficiency. A comparative evaluation of the performance of the proposed approach with the conventional algorithm is presented.