Active integrated devices PDN vector fitting modeling method
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摘要: 基于矢量拟合(VF,Vector Fitting)原理和电路综合理论,提出了一种有源集成器件宽带电路建模方法,用于电磁兼容仿真.将在直流偏置下测量获得的端口参数采用矢量拟合方法转化为极点-留数与时域状态方程的形式;然后创建时域电路模型,将状态方程转化为与SPICE(Simulation Program with Integrated Circuit Emphasis)兼容的网表电路模型.该网表可以代替原芯片PDN(Power Distribution Network)用于电路仿真,最后使用该方法对样本芯片PDN模块建模并与相应的集成电路等效模型(ICEM,IC Electromagnetism Modeling)进行对比,结果表明:矢量拟合模型相比ICEM模型具有更宽的有效带宽以及更小的模型误差.Abstract: Based on the vector fitting principle and circuit theory, a kind of active integrated device wideband circuit modeling methods for electromagnetic magnetic compatibility(EMC) simulation was proposed. The port parameters in DC bias obtained by measurements using vector fitting method were transformed into pole-residue and time domain state equation model; then a circuit netlist model which compatible with simulation program with integrated circuit emphasis(SPICE) was obtained, the netlist can replace the target chip used in circuit simulation. Finally, this method was used for sample chip power distribution network(PDN) module and was compared with the IC electromagnetism modeling(ICEM) modeling. The results show that the vector fitting model has a wider bandwidth and smaller model errors.
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