Multimedia Link Power Line Signal Return Path
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Solution Overview
Problem
High-speed wired communication via multimedia links faces challenges with signal integrity due to attenuation, crosstalk, and connector size, where increasing data throughput or signal pairs leads to increased costs and complexity, and existing solutions often result in trade-offs that compromise signal integrity.
Innovation Solution
The implementation of a multimedia link with a plug and receptacle that include ground and power planes positioned close to each other, acting as signal return paths, along with a shield plane to reduce crosstalk and control impedance, enhancing signal integrity without significantly increasing physical dimensions or costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of signal pairs within the multimedia link is increased to increase data throughput, then the data throughput is improved, but the width of the connector must be increased which increases cost and creates signal integrity differences between pairs
Solution Approach 1:
The power line is made to serve dual functions: power transmission and signal return path. By configuring the power line as a signal return path, the connector can support higher data throughput without increasing connector width, as the same physical infrastructure (power line) performs multiple roles.
Solution Approach 2:
The electrical characteristics of the power line are changed by configuring it as a signal return path. This parameter change allows the power line to carry signal returns in addition to power, effectively increasing the number of usable signal pairs without adding physical width to the connector.
2Productivity
If the data rate of a signal pair is increased to increase data throughput, then the data throughput is improved, but the cable attenuation increases significantly
Solution Approach 1:
The power line serves dual purposes as both power transmission and signal return path. This configuration provides a dedicated low-impedance return path for high-speed signals, reducing signal reflections and attenuation while maintaining high data rates.
Solution Approach 2:
The power line acts as an intermediary return path between signal pairs. By using the power line as a signal return path, signals have a controlled impedance path that reduces attenuation and improves signal integrity at high data rates.
3Object-affected harmful factors
If larger spacing among signal wires is used to reduce crosstalk, then crosstalk is reduced, but the physical dimension and cost increase
Solution Approach 1:
The power line is configured as a signal return path, which provides a controlled impedance path that reduces signal interference. This allows signal wires to be positioned closer together without increasing crosstalk, as the power line's low impedance provides a stable reference that minimizes electromagnetic interference.
Solution Approach 2:
The electrical parameters of the connector are optimized by configuring the power line as a signal return path. This creates a controlled impedance environment that reduces crosstalk between signal pairs, allowing tighter spacing without sacrificing signal integrity.
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 configuration enhances signal integrity by utilizing both ground and power lines as signal return paths and reduces crosstalk, maintaining high-speed communication efficiency while keeping the connector compact and economical.
Implementation Method 1
a power pin of the plug connects the ground plane to a power line included in the cable of the multimedia link. In one example, the ground plane and power plane are placed within a threshold distance of one another, such that the power line connected to the power plane via the power pin behaves as a signal return path
Data Source
AI summary
In one embodiment, a source device and sink device communicate with one another via a multimedia link. The multimedia link includes a cable and a plug. The cable includes one or more data lines, power lines, ground lines or control bus lines. The plug includes a plurality of pins each connected to the one or more lines included in the cable. The plug also includes a ground plane and a power plane, wherein a ground pin of the plug connects the ground plane to the ground line of the cable of the multimedia link and a power pin of the plug connects the ground plane to the power line of the cable. In one example, the ground plane and power plane are placed within a threshold distance of one another, such that the power line connected to the power plane via the power pin behaves as a signal return path.