I hear from a lot of engineers who have trouble getting their simulations and measurements to agree, so if you are having trouble, you are not alone. One of the most common problem areas is with the measurement of the Multilayer Ceramic Capacitor (MLCC) decoupling capacitors, and with good reason. Ceramic decoupling capacitors are sensitive to AC and DC bias. The frequency dependent Equivalent Series Resistance and very small parasitic inductance (ESL) also come into play. As if these details are not enough of a headache already, the required measurements are different for use in EM simulators, like Keysight ADS, and SPICE simulators, which do not include PCB impacts. This article will focus on calibration and de-embedding component measurements to help improve matching. Previous articles cover DC and AC bias effects.
What Accuracy Do We Need to Measure?
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