SLAAET6 August   2025

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1S-Parameter Definition
    1. 1.1 Insertion Loss (S21)
    2. 1.2 Return Loss (S11)
  5. 2High-Speed Signal Design Example Of FPD-Link™ Serializer Body
    1. 2.1 Design Example Overview
    2. 2.2 Key Points in High-Speed FPD-Link Layout Design
  6. 3Factors Impacting Return Loss and Optimization Guidelines
    1. 3.1 Transmission Line Impedance Impact
    2. 3.2 AC Coupling Capacitor Landing Pad Impact And Optimization
      1. 3.2.1 Mitigation Strategy: Anti-Pad Implementation
      2. 3.2.2 Simulation Results With Ansys® HFSS
    3. 3.3 Through-Hole Connector Footprint Impact and Optimization
      1. 3.3.1 Through-Hole Connector Via Anti-Pad Impact
        1. 3.3.1.1 Simulation Results With Ansys® HFSS
      2. 3.3.2 Surrounding Ground Vias Impact
        1. 3.3.2.1 Simulation Results (Surrounding Ground Vias Impact)
      3. 3.3.3 Non-Functional Pad Impact
        1. 3.3.3.1 Simulation Results (Non-Functional Pad Impact)
    4. 3.4 Generic Signal Via Impact and Optimization
      1. 3.4.1 Simulation Results
    5. 3.5 ESD Diode Parasitic Capacitance Impact and Optimization
  7. 4Summary

1 S-Parameter Definition

S-parameters, or scattering parameters are a set of values that completely describe the electrical behavior of a network at a given frequency. S-parameters quantify the ratio of the power wave reflected or transmitted from a port to the power wave incident upon another port. S-parameters are widely used to characterize RF and high-speed digital components and systems. Figure 1-1 illustrates the simplified S-parameters model including S11 and S21.

S-Parameter Model - S11 And S21 Figure 1-1 S-Parameter Model - S11 And S21