DDR4 PDN 仿真与测量：比较 DDR4 电源网络仿真与测量的相关性研究

本文讨论 PCB 供电网络 (PDN) 与使用 HyperLynx PI 执行的去耦仿真的相关性，在 DDR4 1.2V 电源轨的频域行为与确保在特定频率范围内实现最大目标 PDN 阻抗的目标之间建立了关联。尽管 DDR4 被认为是一种主流技术，但仍有很多工程师在实现以更高速度运行的可靠接口方面举步维艰。

Key advantages of performing DDR4 PDN simulations

DDR4 PDN simulation also offers three key advantages:

1. All circuit nodes are controllable and observable. This is not the case with physical prototypes and can make debugging difficult.
2. Observing circuit behavior does not disturb the circuit. Physical measurement always introduces parasitics, like probe capacitance, which alter the behavior of the system, as predicted by quantum theory.
3. Observation of circuit behavior is ideal; for example, simulation results are not limited by probe bandwidth.

What you will learn

• Introduction to the PCB components used and the corresponding electrical characteristics which are important for simulation and measurement.
• How simulation is used to determine proper capacitor locations and values. It also gives recommendations to configure the software properly.
• Details of the process used to assemble test boards.
• Measurement methods and best practices used to guarantee good accuracy.
• Filtering methods used to mitigate measurement noise to improve the fit between simulation and measurements.
• The results, providing recommendations that allow readers to perform similar measurements themselves.

Learn more about HyperLynx DDRx Interface Design.