Memory Module PCB Layout for Dense Signal Routing
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Solution Overview
Problem
Memory systems face constraints related to signal routing complexity, printed circuit board layer requirements, and space utilization within equipment rack form factors, particularly in high-density configurations and rapid data access scenarios.
Innovation Solution
A memory module design with optimized component placement and routing architecture, featuring memory devices adjacent to one edge and buffer components at the opposite edge, along with cross-surface electrical coupling and reduced PCB layers, enabling efficient signal distribution and reduced electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory devices and buffer components are positioned at various locations on PCB following standardized form factors, then electrical pathways can be established between memory components and processors, but signal routing complexity increases and PCB layer requirements increase
Solution Approach 1:
The patent positions buffer components on the opposite surface of the PCB relative to memory devices, utilizing the third dimension (vertical stacking) to reduce signal routing complexity. This spatial reorganization allows signals to travel shorter distances and reduces the number of PCB layers needed, directly addressing the contradiction between signal integrity and routing complexity.
Solution Approach 2:
Instead of placing buffer components on the same surface as memory devices (conventional approach), the patent inverts the arrangement by positioning them on opposite surfaces of the PCB. This inversion simplifies the signal path and reduces routing complexity while maintaining electrical connectivity between memory components and processors.
2Ease of operation
If standardized form factors with various component locations are used, then memory modules can connect to system boards through edge connectors, but space utilization within equipment rack form factors is reduced
Solution Approach 1:
By moving buffer components to the opposite PCB surface, the patent reduces the horizontal footprint of the memory module, enabling better space utilization within equipment rack form factors while maintaining standard edge connector compatibility for system board connectability.
3Device complexity
If buffer components are positioned near memory devices, then signal distribution is simplified, but electromagnetic interference increases
Solution Approach 1:
The patent segments the PCB into distinct functional zones: memory devices on one surface, buffer components on the opposite surface, and dedicated signal routing layers in between. This segmentation reduces electromagnetic interference by separating noisy components while maintaining organized signal distribution paths.
Solution Approach 2:
The patent introduces dedicated signal routing layers as intermediaries between memory devices and buffer components. These intermediate layers organize and control signal flow, simplifying signal distribution while reducing electromagnetic interference through controlled impedance paths and proper layer stacking.
Data Source
AI summary
Provided is memory module comprising a printed circuit board (PCB) having a first surface and a second surface opposite the first surface, and a connector edge comprising a set of electrical contacts configured for insertion into a memory socket. The memory module further comprises a plurality of memory devices and a first buffer component and a second buffer component. The PCB comprises a first and a second signal routing layer respectively associated with the first and second surfaces, each signal routing layer comprising a control signal input line from the set of electrical contacts to the respective buffer component, control signal output lines from the buffer component to the plurality of memory devices, and data signal lines from the set of electrical contacts to the plurality of memory devices.