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The authors prove that for any arbitrarily chosen digital IC with an internal distribution of the inverter threshold voltage, the minimum energy dissipated per logical operation limited by thermal noise-induced error rate will be several times greater than in an idealized IC (with the threshold voltage equal exactly to half the supply voltage). Basic assumptions are taken from K.U. Stein's (1977) work. More general foundations have, on the other hand, been adopted as applicable to the inverter threshold voltage distribution inside an IC. The effect the threshold voltage-supply voltage ratio has on the minimum switching energy was analysed. This ratio has been identified as parameter `a'.