These anomalies are exacerbated in very high voltage designs. High Voltage and High Current Applications Bob Dobkin, Jim Williams, in Analog Circuit Design, 2011 Parasitic capacitance effects in step-up transformer design (13) This chapter explores the causes of the large resonating current spikes on the leading edge of the switch current waveform. With known voltage variations between the correlated sections of adjacent turns and layers, the total capacitive energy stored in the coil structure can be calculated from the distributed capacitance of each segment, which can be derived using the ideal double plate capacitor formula. The voltage profile is obtained by averaging the beginning and ending potential across the coil structure. In this approach, a planar coil is decomposed into equal sections by assuming consistent thickness and width of conductive traces everywhere. A distributed model has been developed to estimate the equivalent parasitic capacitance, as discussed elsewhere ( Wu, 2003 Zolfaghari et al., 2001 ).