Impact of Waveform Modulation from Electromagnetic Interference Sources on Coupling to Digital Electronic Interconnects

• Main Authors: Esmaeili, Mona, Hemmady, Sameer D., Noakoasteen, Oameed, Christodoulou, Christos, Schamiloglu, Edl, Zarkesh-Ha, Payman
• Format: Conference Proceeding
• Language: English
• Subjects: and waveform optimization; Couplings; Electromagnetic compatibility; Electromagnetic interference; electromagnetic interference and emission; Fourier series; Modulation; noise margin in digital electronics; Optimization methods; Radio frequency; Radiofrequency interference; Shape; Voltage measurement
• ISSN: 2325-0364
• DOI: 10.1109/EMCEurope59828.2024.10722090

The coupling of electromagnetic interference (EMI) from extraneous Radio Frequency (RF) sources on digital electronic interconnects is of critical importance in the Electromagnetic Compatibility (EMC) engineering community. Typically, in such analysis, the EMI is treated as a Continuous Wave (CW) signal that impinges on the digital electronic system. However, it should be noted that EMI signals can have varied temporal and spectral characteristics, and the question arises on how to incorporate waveform modulation into EMI analysis of digital interconnects. In this paper, we present a mathematical formulation on how to incorporate waveform modulation into EMI coupling analysis and utilize it to demonstrate that specific waveform modulations can lead to enhanced coupling effectiveness as compared to conventional CW stimulus. In a test case studied in this paper, the use of our methodology suggests that an optimally modulated EMI signal can enhance coupling by 27% as compared to a single-tone CW EMI signal. We also present an analytical optimization method to obtain the optimal EMI waveform modulation that maximizes the coupling effectiveness of EMI using a Fourier series approximation approach. This technique can be utilized by EMC engineers to develop robust shielding margins for various classes of EMI signals.