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本文首先提出了一个在NTN(Nose-to-Nose)校准中实际应用的50GHz宽带采样电路的SPICE默认仿真模型;然后通过设计采样电路的模型参数,使仿真的NTN冲击响应与实际测量重构的50GHz宽带采样示波器冲击相应波形基本相似.当仿真结果和测量结果近似时,可以通过仿真试验估计出采样电路对相位误差的影响,这和实际的物理采样电路对相位误差的影响是相同的,而该误差的影响却无法用实际测量实验确定;最后研究其收敛特性从而确定正确的仿真条件,目的是确保在较宽的元件参数取值范围内,该SPICE仿真模型对参数研究具有足够的鲁棒性.
This paper first presents a SPICE default simulation model of a 50GHz wideband sampling circuit used in NTN (Nose-to-Nose) calibration. Then, by designing the model parameters of the sampling circuit, the simulated NTN impulse response is compared with the actual measured reconstruction When the simulation result and the measurement result are similar, the influence of the sampling circuit on the phase error can be estimated through the simulation experiment, which has the same influence on the phase error of the actual physical sampling circuit, The effect of this error can not be determined by actual measurement experiments. Finally, the convergence characteristics of the SPICE simulation model are studied to determine the correct simulation conditions. The purpose is to ensure that the SPICE simulation model has sufficient robustness to parametric studies over a wide range of component parameters Sex.