电压信号的非线性问题和多输入跳变现象给时序分析带来了严重挑战.为更好地解决此问题,文中设计电路对门单元输入端和内部节点间的密勒电容进行了验证,从器件结构上分析了其来源,并通过引入该电容改进了已有多输入跳变电流源模型,以获得更高的模型精度;同时将二输入门单元模型扩展到多输入门单元,并详述了建模方法.多种门单元上的数值实验结果表明,与已有模型相比,在可接受的时间开销内,文中模型能够显著地提高门单元时延和输出波形的仿真精度.%The non-linearity of I/O signals and multiple-input-switching effects bring serious challenges to timing analysis. To alleviate these problems, the Miller capacitance between input and internal nodes of gate cells are verified by designed circuit and device structure is analyzed to clarify its source. An Advanced Multiple-Input-Switching Current Source Model with higher accuracy is developed by introducing such capacitance and the proposed modeling method is extended to handle multiple-input gates. Numerical experimental results for various gate cells demonstrated that the proposed model significantly improves the simulation accuracy for delays and waveforms compared with the existing ones.
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