Power supply current analysis of micro-controller with considering the program dependency

To simulate power supply noise of an LSI, an EMC macro-model, LECCS-core, is under development. The LECCS-core model consists of a linear equivalent circuit and equivalent current sources. In this paper, program-dependent current elements are extracted for functional blocks of a microcontroller. By combining these component currents with considering the program sequence, the power supply current is simulated both in time domain and frequency domain. Even when the LSI runs different programs with different clock frequencies, noise spectra consisting of harmonics and sub-harmonics are reproduced in good agreement with measured data.