![]() ![]() As a result, manufacturers sometimes provide insertion loss results in four representative topologies, as shown in Figure 2.įigure 2 Insertion loss shown in the datasheet, four set-ups were tested, mode A-DĪ simplified simulation model in SPICE simulation toolĪ SPICE-based simulation tool provides a quick and cost-effective way of filter performance analysis. It is understood that CISPR 17 provides a measured impedance that provides an optimal filter performance prediction (in reality the impedance of neither the source nor the load is 50Ω). Understanding filter performance measurement per CISPR 17Īccording to, CISPR 17 defines the measurement set-ups for filters. This article summarizes our approach to build a sufficiently accurate filter simulation, step by step. ![]() Once the simulation model is proved to be accurate enough, we can then quickly design our own filter and gain a good confidence level with an implemented design of our choosing. However, we can use this filter as a benchmark and can aim for a simulation that would agree with experimental results. In this case, we have the datasheet from the manufacturer that provides a reasonable result. Unfortunately, when it comes to EMC, due to the prevalence of parasitic parameters and the nonlinearity associated with frequency, simulation modeling often takes a long time to develop and may not predict a result that agrees with the experiment. However, a simulation model needs to be accurate enough so that the result does not over-predict or under-predict the filter performance (which is usually characterized as insertion loss). 224 Gb/s Per Lane: Options and ChallengesĪ quick simulation can give design engineers a good confidence level when designing a customized filter solution. ![]()
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