Intel VC820 Design Guide - Page 119
More Details and Insight, 3.4.1 Textbook Timing Equations
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Advanced System Bus Design 3.4 More Details and Insight 3.4.1 Textbook Timing Equations The "textbook" equations used to calculate the propagation rate of a PCB are the basis for spreadsheet calculations for timing margin based on the component parameters. These equations are: Equation 3-6. Intrinsic Impedance Z0 = L0 C0 (Ω) Equation 3-7. Stripline Intrinsic Propagation Speed S0_ STRIPLINE = 1.017 * εr (ns/ft) Equation 3-8. Microstrip Intrinsic Propagation Speed S0_ MICROSTRIP = 1.017 * 0.475*εr + 0.67 (ns/ft) Equation 3-9. Effective Propagation Speed SEFF = S0∗ 1 + CD C0 (ns/ft) Equation 3-10. Effective Impedance ZEFF = Z0 1+ CD C0 (Ω) Equation 3-11. Distributed Trace Capacitance C0 = S0 Z0 (pF/ft) Equation 3-12. Distributed Trace Inductance L0 = 12∗Z0∗ S0 (nH/ft) Intel®820 Chipset Design Guide 3-19