Development of an EMI Detector Based on an Inverted Data Pair with Reduced Number of False Negatives

Abstract

This paper proposes a design of an EMI detector, based on an inverted data pair, for the detection of unwanted electromagnetic disturbances on a wired communication channel with the aim to reduce the overall safety risks related to bit errors on such a communication channel. The EMI detector can detect unwanted electromagnetic (EM) disturbances and generate a warning, which can help the system to follow a precautionary procedure. The performance of the EMI detector is analysed by simulating a random pattern of transmitted bits through a wired channel in the presence of (continuous wave) EMI with varying amplitude, phase, frequency and phase difference between the lines in the inverted data pair. This performance itself is determined by two main metrics: (I) false positives, the number of generated warnings when there is no bit error and, (II) false negatives, the number of bit errors without any warning given by the detector. An ideal EMI detector would have zero false positives and zero false negatives. In this paper, the goal is mainly to reduce the number of false negatives. The EMI detector can be made by using low-cost electronics. It works quite effectively in most of the cases and works better than other detectors presented before in literature.