1：Experimental Design and Method Selection:

The study involves setting up experiments to measure scattering parameters and common-mode current for common-mode filters cascaded with different ESD protection devices, using symmetric and asymmetric layouts to evaluate mode conversion and noise suppression.

2：Sample Selection and Data Sources:

Evaluation boards (EVBs) for two-line and four-line ESD protection devices are used, along with a common-mode filter based on a two-layered PCB structure. Data is acquired through measurements of scattering parameters and common-mode current using equipment like signal generators, current probes, and spectrum analyzers.

3：List of Experimental Equipment and Materials:

Equipment includes a signal generator for PRBS signals, current probe for measuring common-mode current, spectrum analyzer for power analysis, and shielding box for isolation. Materials involve PCBs with specific dimensions (e.g., thickness 0.4 mm, dielectric constant 4.3) and ESD protection devices.

4：4 mm, dielectric constant 3) and ESD protection devices. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Steps include measuring scattering parameters (e.g., |Scc21| and |Scd21|) for the common-mode filter and ESD devices, simulating differential-mode and common-mode spectra with skew, and measuring common-mode current in various scenarios with controlled setups in a shielding box.

5：21| and |Scd21|) for the common-mode filter and ESD devices, simulating differential-mode and common-mode spectra with skew, and measuring common-mode current in various scenarios with controlled setups in a shielding box. Data Analysis Methods:

5. Data Analysis Methods: Analysis involves comparing scattering parameters and common-mode current levels across different configurations, using Fourier transform for spectral analysis, and interpreting results to assess degradation in noise suppression.