In this ebook, we will dive into the world of designing and measuring a DDR4 power rail on a PCB. We will guide you step-by-step through a complete process that is accessible to any hardware engineer using low-cost tools and prototypes.

1. Designing the PCB: In this step, we will use software such as Xpedition Layout to define the circuit layout, place components, trace tracks, and choose power planes. We will make use of HyperLynx PI to optimize the placement and values of the decoupling capacitors, ensuring a stable and clean power supply to our DDR4 rail. We will not forget to consider low-cost manufacturing constraints to keep the design feasible and cost-effective.
2. Simulating behavior: It is critical to simulate the behavior of the DDR4 power rail. With the help of HyperLynx PI, we can predict the PDN impedance, identify any harmful resonances, and optimize the design for best performance. Simulation allows us to refine the design and avoid problems during implementation.
3. Making the prototype: We will order PCB fabrication from an online service or a local lab, and try our hand at assembling the components, paying attention to quality and accuracy. A final inspection will assure us that the prototype is ready for measurements.
4. Measure Performance: Using a low-cost Vector Network Analyzer (VNA), we will measure the impedance of the DDR4 power rail and evaluate its actual performance. Calibration of the VNA will ensure the accuracy of the measurements, while the precise measurement setup will enable us to obtain reliable data. Data analysis will allow us to compare the results with the simulation and draw conclusions about the design.