This time, serialization will start from the LC composite EMI filter.
<C and L combined, the insertion loss will have a sharp downward trend>
Previously, the combination of capacitors and inductors was introduced, and the insertion loss of the cells decreased more sharply.
Figure 1 shows its graphical features.
Figure 1 Number and frequency characteristics of the filter
As shown in the figure, the greater the number of filter components, the more the filter insertion loss decreases.
<The greater the inclination of the insertion loss characteristic of the filter, the higher the selectivity of the signal and the noise. >
As the slope of the insertion loss characteristic of the filter becomes larger, it is difficult to adversely affect the signal when the signal is close to the frequency of the noise. Figure 2 shows an example where the signal frequency is high and close to the noise frequency. When the frequencies of the two are close, if a filter with a flat insertion loss is used and a constant that can sufficiently reduce the noise is selected, the harmonic component of the signal adjacent to the frequency is sufficiently weakened. As a result, as shown in FIG. 3, the signal waveform becomes gentle. Choosing a constant that does not affect the signal frequency can result in insufficient noise reduction. On the other hand, if a filter with a large inclination change is used, the signal and noise can be separated, and the influence on the signal can be effectively controlled. For this reason, the LC composite filter squelch effect can be used to suppress the influence of the signal waveform on the high-speed signal line as much as possible.
Figure 2 Different effects of different filter characteristics on the signal
Figure 3 Example of waveform trend
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