EMI Suppression Filters (EMC and Noise Suppression)Noise Suppression Basic Course

Chapter 1 describes the reasons for using EMI suppression filters (EMIFIL ), and explains how shields and filters used for electromagnetic noise suppression work.
[Average time required for reading: approx.12 mins]

In order to have a deep understanding of the mechanism of noise interference, Chapter 2 focuses on the issues regarding the noise source side and describes the mechanism of noise occurrence such as how the noise occurs and where it occurs in the electric circuit.
[Average time required for reading: approx.47 mins]

In order to handle the noise interference for electronic devices, you need to understand not only the noise source origin, but also the characteristics of the transmission paths and antennas. Among these topics, Chapter 3 describes noise transmission paths.
[Average time required for reading: approx.50 mins]

Many of the electromagnetic noise interferences are transmitted through space via radio waves. Chapter 4 describes the spatial conduction of noise. The chapter first discusses the interference between circuits (problem of short distance) and then describes the antenna theory (problem of long distance) and shielding to block this problem.
[Average time required for reading: approx.57 mins]

Chapter 5 first describes the existence of two modes (common mode and normal mode) for noise to be transmitted through a conductor and then describes the conversion into common mode.
[Average time required for reading: approx.49 mins]

Chapter 6 describes the typical filter configuration used in noise suppression and how the actual characteristics of electronic parts used affect noise suppression results.
[Average time required for reading: approx.55 mins]

To resolve the problem of noise inflicted onto radios, TVs, and other devices by digital devices, EMI suppression filters have become widely used. This theme provides examples of the proper use of typical EMI suppression filters: capacitors, resistors, and ferrite beads. Also, this theme explains the reason why the noise suppression effect varies among sets.
[Average time required for reading: approx.21 mins]

Radiation noise and other noise increase with the acceleration of the signal speed of digital signal lines. If the amplitude of the signal voltage is lowered to accelerate the signal speed, ringing of the signal waveform becomes a problem. This theme describes the changes in the waveform and radiation noise when a resistor is added to a standard logic IC and impedance matching is performed, as well as how to select ferrite beads for signal lines for which impedance matching has been performed.
[Average time required for reading: approx.8 mins]

Differential transmission is widely utilized for high-speed signal lines of noise countermeasures of recent electronic devices. This theme explains the reason for this, the noise that should be taken into consideration in the differential transmission line, and the suppression methods for the noise. This theme also explains the basis of the mixed S parameter, which represents the transmission characteristics of the differential transmission line, and the effect of these characteristics.
[Average time required for reading: approx.13 mins]

It can often be difficult to determine what EMI noise suppression measures to use with electronic devices, due to the overall strength of noise. If a phenomenon called "common mode noise" spreads throughout the entire device, it will be impossible to visualize the issue even if something seems wrong.
In this presentation, we discuss how we employed a 3D electromagnetic field simulator to visualize how noise spreads and propagates.
[Average time required for reading: approx.20 mins]