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Interconnect resistance and inductance shield part of the load capacitance, resulting in a faster voltage transition at the output of the driver. Ignoring this shielding effect may induce significant error when estimating short-circuit power. In order to capture this shielding effect, an effective capacitance of a distributed RLC load is presented for accurately estimating the short-circuit power. The proposed method has been verified with Cadence Spectre simulations. The average error of the short-circuit power obtained with the effective capacitance is less than 7% for the example circuits as compared with an RLC model. This effective capacitance can be used in look-up tables or in empirical -factor expressions to estimate short-circuit power.