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Interconnect and Packaging Lecture 3: Skin Effect

Explore the impact of skin effect on transmission lines, coaxial cables, and impedance in interconnect models. Learn about skin depth, wave propagation, and characteristic impedance in different configurations.

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Interconnect and Packaging Lecture 3: Skin Effect

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  1. Interconnect and PackagingLecture 3: Skin Effect Chung-Kuan Cheng UC San Diego

  2. Outlines • Transmission Line Model • Spectrum of Configurations • Skin Effect • Coaxial Cable

  3. I. Transmission Line Model • Voltage drops through serial resistance and inductance • Current reduces through shunt capacitance • Resistance increases due to skin effect • Shunt conductance is caused by loss tangent

  4. I. Interconnect Model • Telegrapher’s equation: • Propagation Constant: • Wave Propagation: • Characteristic Impedance

  5. I. Interconnect Model • Propagation Constant: • Wave Propagation: • Characteristic Impedance

  6. I. Interconnect Model (Constants)

  7. II. Spectrum of Configurations

  8. III. Skin Effect Assuming that resistance and capacitance are negligible. Skin Depth (Equivalent Depth of Uniform Current)

  9. III. Skin Effect Boundary condition: • Charges at the boundary shield the electric field. • Thus, capacitance C does not change with frequency.

  10. IV. Coaxial Cable

  11. IV. Coaxial Cable: Inductance

  12. IV. Coaxial Cable: Inductance

  13. IV. Coaxial Cable: Inductance

  14. IV. Coaxial Cable: Impedance

  15. IV. Coaxial Cable: Impedance

  16. Skin Effect

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