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Chapter 2 has described the overview of the noise source origin of electronic devices and in particular, has further described the mechanism of noise being caused by digital circuits, which often poses a problem. The relationship of topics described in this section is as follows:
Fig. 2-5-1 Relationship of topics
There are three cases for the noise sources of electronic devices as shown in Fig. 2-5-2.
Digital circuit is a typical circuit that can emit the nose of (i) and (ii). A digital circuit operates with various frequency components called harmonics. This current flows not only in the signal line but also in the power supply and ground. However, if any leaks to the outside, it becomes noise as shown in Fig. 2-5-3. To make full use of digital circuits, the EMC design is required for the signal and power supply as shown in Fig. 2-5-3. This chapter describes the basic theory that is required for this EMC design.
Next: Chapter 3 Factors of making noise problems complex