EMI Suppression Filters (EMC and Noise Suppression)Noise Suppression Basic Course Section 1
Chapter 3 Factors of making noise problems complex

3-5. Summary of Chapter 3

Chapter 3 has described the topics around digital circuit as a noise source and learnt about the concepts and terms regarding the conductor conduction of noise. The relationship of topics and concepts described in this section is as follows:]

Fig. 3-5-1 Relationship of topics

As described in Chapter 2, components of various frequencies are used in digital circuits. Although many of these components are needed for the circuit operation, it causes noise when it leaks out to the outside. In such a case, noise can be strong or weak depending on the frequency due to the involvement of the above factors. These frequency characteristics vary when the the circuit conditions change. Therefore, you need to understand such phenomena to predict and control the change of noise.
The concepts described in this chapter are also useful to provide solutions for the noise source origin regarding those other than digital circuits and problems of noise reception.
Noise conduction occurs through conductor conduction and spatial conduction. Chapter 4 will describe the concepts regarding the spatial conduction.

Fig. 3-5-2 Summary of Chapter 3

[Reference]

[1]

[Japanese] 電気理論（第2版）
池田哲夫
森北出版 2006

[2]

High-Speed Digital Design: a Handbook of Black Magic
Howard Johnson, Martin Graham
Prentice Hall PTR, 1993

[3]

High-Speed Signal Propagation: Advanced Black Magic
Howard Johnson, Martin Graham
Pearson Education, Inc. 2003

[4]

[Japanese] よくわかるプリント板実装の高速・高周波対策
井上博文
日刊工業新聞社 2009

[5]

Application Manual for Power Supply Noise Suppression and Decoupling for Digital ICs (PDF: 3.6MB)
Murata Manufacturing Co., Ltd. Catalog C39E, 2010

Next: Chapter 4 Spatial conduction and its countermeasures