Analysis upon the effect of the immunity of electronic devices by the emitted digital modulated signals

Evaluation of radiated immunity tests using adjusted pulse modulated signals

“…Consequently, similar analyses can be conducted over other frequencies as well, through the same modelling procedure. As an example, one can consider the following frequency bands, which have already been studied by other researchers within the RI test scope and are therefore potential case studies for the proposed methodology: 80–90 MHz: Keum et al [6] have tested a cordless telephone by employing the standardised amplitude modulation (AM) waveform against other modulation schemes and by considering the signal‐to‐noise and distortion ratio (SINAD) levels as the comparison criteria; they have concluded that the former signal's SINAD levels are more severe than those in the 80–84 MHz sub‐band, whereas the opposite is observed when compared to the 85–90 MHz range; 100–600 MHz: a similar analysis has been applied to a Korean Marine radio indicating that the SINAD levels can vary according to the modulation schemes and the sub‐bands as well [6]; 820–920 MHz, 1920–1980 MHz, 2400–2500 MHz: Keum et al [6] have also compared the effects of both AM and PM waveforms over an analogue television by considering the picture distortion as the comparison criterion; they have concluded that the latter can cause more interference than the former. Other potential frequency ranges for the proposed methodology can be found in references [4, 5, 7–10].…”

“…This kind of questioning can be found in recent literature, with results based on some specific DUTs. Some authors focus the discussion on the differences between standardised and real waveforms in terms of modulation [4–9], while others analyse the amplitude [10]. Although not directly related to the RI test, reference [11] brings interesting results regarding the impact of different intentional electromagnetic interference (IEMI) waveforms over a railway communication system.…”