Device-Specific Power Delivery Network (PDN) Tool 2.0 User Guide

ID 683293
Date 8/24/2021
Public
Document Table of Contents

1.3.2.2. Rail Group Summary

The PDN tool automatically calculates the target impedance (ZTARGET) based on the recommended Dynamic Current Change% and Noise Tolerance%.
Figure 25. Rail Group SummaryBoxes shaded in light blue are drop-down menus with different options to select. Core Clock Frequency and Current Ramp Up Period options vary depending on your design.

With these options enabled, the ZTARGET curve relaxes from certain frequencies based on the inputs.

Figure 26. Flat versus Curved ZTARGET