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Delta-I noise suppression techniques were experimentally investigated on a 16-layer functional board up to 12 GHz. The effect of embedded and high-frequency discrete decoupling capacitors was analyzed both in the frequency and time domains. While noise suppression capabilities of high-frequency discrete decoupling capacitors are restricted to about 250 MHz and below, the embedded capacitance layers are observed to be effective all over the high-frequency range. Instead of using the conventional discrete Fourier transform (DFT), the time domain response is obtained more efficiently by exploiting the periodicity of the delta-I noise. Time domain analysis indicates, when used with embedded capacitance layers, the additional benefit of high-frequency discrete decoupling capacitors are negligible to systems running at very high clock frequencies.