Modeling and Measurement of Ground Bounce Induced by High-Speed Output Buffer With On-Chip Low-Dropout (LDO) Regulator

Abstract

This study proposes a model of ground bounce induced by a high-speed output buffer with on-chip low-dropout (LDO) regulator. When the output buffer operates with a high-speed clock, high output impedance of the pass transistor and low impedance of the on-chip decoupling capacitor at load enable the ground bounce calculation by only using the self-impedance of the off-chip ground network and switching current spectra. The accuracy of the proposed model is indirectly validated by measurement. Simulated ground bounce by using the proposed model shows very good correlation with the experimentally validated SPICE model.