AN 958: Board Design Guidelines

ID 683073
Date 1/28/2022
Public
Document Table of Contents

5.1.5.5.3. Using Series Termination

When using series termination, only near-end termination can be applied. Series termination should only be used with clock signals. With the near-end series termination (Z0) and the transmission line following, the circuit looks like a voltage divider circuit to the driver, reducing the amplitude V at the driver to V/2 after the series termination. Because there is no termination at the end of the transmission line, when the signal reaches the end, the entire signal reflects being restored to V.

The reflection coefficient is calculated using the following equation:

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