Frequency-domain supply current macro-model

In order to perform block level analysis of the on-chip power distribution network, a high-level model is required that captures the dependence of the current waveform drawn by a logic block, per cycle, on its input vector pair. We present a frequency domain macro-modeling technique for capturing this dependence. The macro-model is based on estimating the Discrete Cosine Transform (DCT) of the current waveform and then taking the inverse transform to estimate the time domain current waveform.