Memory Module VRM with Stitching Capacitors for Power Plane Coupling
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Solution Overview
Problem
Long distances in power distribution from a motherboard to a memory module result in high DC voltage drops and inductances, leading to decreased memory output stability and increased costs due to the need for robust and costly voltage regulator modules (VRMs) on the motherboard.
Innovation Solution
Incorporating a VRM on the memory module with stitching capacitors to couple power planes, allowing the motherboard to use a simpler, lower-capacity VRM, thereby reducing power loss and noise while maintaining signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a robust VRM is used on the motherboard to support long power distribution distances, then power delivery capacity is improved, but system cost increases and voltage drops worsen
Solution Approach 1:
The power delivery function is segmented between the motherboard VRM and the memory module VRM. The motherboard VRM provides bulk power conversion, while the memory module VRM provides localized fine-tuned regulation close to the memory chips, dividing the power delivery task to reduce overall system cost and improve efficiency
Solution Approach 2:
The power regulation function is moved from a single plane (motherboard) to multiple planes (motherboard VRM plus on-module VRM), creating a distributed power architecture that reduces the effective power distribution distance and allows for lower-capacity, lower-cost components on each platform
2Power
If a robust VRM is used on the motherboard to support long power distribution distances, then power delivery capacity is improved, but DC voltage drops increase
Solution Approach 1:
The memory module VRM acts as an intermediary power regulation stage between the motherboard VRM and the memory chips. It receives power from the motherboard VRM and provides localized regulation, serving as a mediator that reduces the effective distribution distance and minimizes voltage drops across the power delivery network
Solution Approach 2:
The power distribution path is segmented into two stages: bulk power delivery from the motherboard VRM followed by localized fine-tuned regulation at the memory module VRM. This segmentation reduces the effective distance over which voltage drops occur and allows each VRM to be optimized for its specific function
3Object-affected harmful factors
If power planes are coupled with stitching capacitors, then power noise is reduced, but device complexity increases
Solution Approach 1:
Stitching capacitors are introduced as intermediary elements between different power planes and ground references. These capacitors provide localized decoupling and noise filtering at critical interfaces, acting as mediators that suppress power noise without requiring complex active filtering circuits
Solution Approach 2:
The impedance characteristics of the power distribution network are modified by adding stitching capacitors, which change the frequency-dependent impedance profile to provide better noise filtering. This parameter change approach uses passive components to achieve noise reduction rather than complex active control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach decreases system costs, reduces power noise, and improves signal integrity by shortening the power delivery network distance, allowing for lower-capacity, lower-cost VRMs on the motherboard and more efficient power delivery to memory modules.
Implementation Method 1
A sufficient number of stitching capacitors are to couple the first power plane to the second power plane
Data Source
AI summary
An example device in accordance with an aspect of the present disclosure includes a memory module having a voltage regulator module (VRM) to receive input power and deliver output power to components of the memory module at a first power plane. A sufficient number of stitching capacitors are to couple the first power plane to a second power plane.