I/O Coupling EMI Calculator

High frequency signals can couple to I/O nets that carry the coupled energy away from the board. The common-mode currents induced on cables attached to I/O nets can result in significant radiated emissions. A closed-form expression was developed to estimate the maximum radiated emissions in [1]. The algorithm employed to make the calculations below is described in [2].

Top View	Side View
Board Length (L) =  mm Width (W) =  mm Dielectric constant (εr) = Traces Width (a) =  mm Distance (s) =  mm Height (t) =  mm Coupling length (lcoupling) =  mm I/O line length (ltrace) =  mm Circuit Terminations RL=  Ohm RNE=  Ohm Voltage Source Digital Signal - Trapezoidal WaveformSwept Frequency - Constant Voltage Amplitude A):  V Lower frequency (f0):  MHz Upper frequency (f1):  MHz

[1] C. Su and T. Hubing, "Calculating Radiated Emissions due to I/O Line Coupling on Printed Circuit Boards using the Imbalance Difference Method," IEEE Trans. on Electromagnetic Compatibility, vol. 54, no. 1, Feb. 2012, pp. 212-217.

[2] C. Zhu and T. Hubing, "Maximum Radiated Emission Calculator: I/O Coupling Algorithm," CVEL-13-045, Aug. 24, 2013.