In this paper, an analytic model of the energy consumption of the Stepwise Adiabatic Circuits (SAC) when it is possible to discharge the load capacitor is proposed. Using this model, analytical derivations are calculated which shows us the power saving of the SACs. Using analytical derivations, the sizing of a capacitor tank is determined for a desired energy saving. For example, the derivations predict that if the sizing of the 3-step series tank capacitors is equal to the load capacitor, the power saving is 55%. Also, if the sizing of the tank is very large the energy saving of a 3-step stepwise charging is equal to 66.7%. Several Simulations in $0.18\mu m$ CMOS technology prove the accuracy of the proposed derivations.

本文提出了一种可能使负载电容器放电时的逐步绝热电路（SAC）能耗的解析模型。使用该模型，计算得出的分析推导向我们展示了SAC的节电效果。使用解析推导确定电容器箱的尺寸，以实现所需的节能效果。例如，推导预测，如果三步串联储能电容器的尺寸等于负载电容器，则节电为55％。同样，如果水箱的尺寸非常大，则三步逐步装料的节能量等于66.7％。中的几种模拟$0.18\mu 米$ CMOS技术证明了所推导方法的准确性。