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February 2015 • The PCB Design Magazine 37 EFFECTS OF DC BIAS On CERAMIC CAPACITORS continues quiet power Figure 3: Capacitance as a function of frequency and DC bias, as measured on a 100 uF 4v Class 2 MlCC part. Figure 4: Capacitance as a function of frequency and DC bias, as measured on a 0.1 uF Class 1 MlCC part. References 1. Wikipedia: Class 1 ceramic capacitors. 2. Wikipedia: Class 2 ceramic capacitors. 3. Wikipedia: Permittivity. 4. Accuracy Improvements of PDN Imped- ance Measurements in the Low to Middle Fre- quency Range," DesignCon 2010, February 1–4, 2010, Santa Clara, CA. 5. DC and AC Bias Dependence of Capaci- tors Including Temperature Dependence," DesignCon East 2011, September 27, 2011, Bos- ton, MA. Dr. Istvan Novak is a distin- guished engineer at Oracle, working on signal and power integrity designs of mid-range servers and new technology developments. With 25 patents to his name, Novak is co-author of "Frequency-Domain Characterization of Power Distribution Networks." To read past columns, or to contact Novak, click here.