Methodology for on-package decoupling capacitor selection with considerations of coupled core and IO power delivery network and simultaneous switching noise effects

This paper presents an efficient methodology for on-package decoupling capacitors (DECAPS) selection with the considerations of minimizing the coupled core power delivery network (Core-PDN) and IO-power delivery network (IO-PDN) noise and the simultaneous switching noise (SSN). The effectiveness of on-die capacitance of the core-logic circuits on the estimation of the package DECAPS is described using the multiport broadband package model. The on-package DECAPS selection based on the current signature spectrum of core-PDN and IO-PDN is also discussed. Simulation results are presented for comparison of the effects of on-package DECAPS estimated with or without core die capacitance and by using power-ground current signature spectrum obtained through SSN simulation of the package.