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Measurement of power distribution network impedance using an error analysis approach

机译：使用误差分析方法测量配电网络阻抗

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摘要

In order to achieve power integrity (PI), power distribution network (PDN) impedance has been designed lower than calculated target impedance in frequency domain. However, with PDN impedance scaling down milliohm order, its measurement accuracy has been limited by the inevitable uncertainty from vector network analyzer (VNA). In this paper, we investigate the uncertainty effects in three impedance measurement methods using an error analysis approach. Impedance error rate is proposed as a function of variable uncertainty and the impedance of device under test (DUT), to represent the measurement accuracy. By analysis, we find that three methods have different accuracy for different DUT impedance ranges, and the appropriate method should be employed for different DUT measurements. Taking a fabricated power ground plane board (a special PDN) as case study, the measured results from three methods are compared with the simulated results from cavity model method and EM simulations in Computer Simulation Technology (CST) Microwave Studio, and the comparison results correlate well with our error analysis results. It's proven that the two-port method based on scattering parameter (S parameter) S performs best with highest accuracy for measuring the PDN impedance scaling down to milliohm order.
机译：为了实现电源完整性（PI），已将配电网（PDN）阻抗设计为低于频域中计算出的目标阻抗。但是，随着PDN阻抗按毫欧量级缩小，其测量精度受到矢量网络分析仪（VNA）不可避免的不确定性的限制。在本文中，我们使用误差分析方法研究了三种阻抗测量方法中的不确定性影响。提出了阻抗误差率，该误差率是可变不确定性和被测设备（DUT）的阻抗的函数，以表示测量精度。通过分析，我们发现三种方法对于不同的DUT阻抗范围具有不同的精度，并且应针对不同的DUT测量采用适当的方法。以制造的电源接地板（特殊的PDN）为例，将三种方法的测量结果与空腔模型方法和EM仿真在计算机仿真技术（CST）Microwave Studio中的仿真结果进行比较，并将比较结果关联起来我们的错误分析结果很好。事实证明，基于散射参数（S参数）S的双端口方法在以最小毫欧量级测量PDN阻抗时，以最高的准确度表现最佳。

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