Active Single-Ended Cable for Intra-Pair Skew Mitigation
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Solution Overview
Problem
High-speed data transmission using differential cables is hindered by significant intra-pair skew, which increases signal distortion and reduces the eye width, especially at higher transmission rates.
Innovation Solution
An active single-ended transmission line that converts differential signals into single-ended signals using gain modules to compensate for signal loss and frequency-dependent channel loss, thereby preventing intra-pair skew.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If differential cables are used for high-speed data transmission, then data transmission capability is improved, but intra-pair skew increases causing signal distortion
Solution Approach 1:
The patent introduces an active cable with signal processing circuits as an intermediary between the transmitter and receiver. These circuits actively compensate for skew and signal degradation by processing the differential signals through controlled impedance transmission lines and equalization stages, thereby maintaining signal integrity at high data rates without requiring complex differential signaling protocols
Solution Approach 2:
The patent changes the transmission mode from differential to single-ended signaling within the active cable. By converting differential signals to single-ended signals internally and using controlled impedance transmission lines with specific characteristic impedance values, the cable actively manages and compensates for signal skew and distortion, transforming the physical transmission parameter to eliminate intra-pair skew issues
2Productivity
If transmission rate is increased to 50 Gb/s, then data transmission capability is improved, but eye width reduces by 50% due to intra-pair skew
Solution Approach 1:
The active cable performs preliminary signal processing by converting differential signals to single-ended signals and applying equalization before the signals reach the receiver. This preliminary action compensates for potential skew and distortion issues in advance, ensuring that even at 50 Gb/s transmission rates, the eye width is maintained at acceptable levels for reliable data reception
Solution Approach 2:
The active cable incorporates signal processing circuits that monitor and adjust signal characteristics in real-time. By using feedback mechanisms within the cable's active components, the system dynamically compensates for skew and distortion, maintaining eye width and signal integrity across different transmission rates including 50 Gb/s
3Ease of operation
If differential signaling is used, then signal transmission is achieved, but intra-pair skew causes difficulty for receiver to determine signal state
Solution Approach 1:
The active cable serves as an intermediary that converts differential signals to single-ended signals, simplifying the signal state detection at the receiver. This conversion eliminates the complexity of determining signal states from differential pairs, making it easier for the receiver to accurately interpret the transmitted data without sophisticated differential signaling protocols
Data Source
AI summary
An active single-ended transmission cable is disclosed. The active single-ended transmission cable allows connection between a first and a second electronic device and comprises a first port, a second port, and a transmission wire. The first or second port is used for receiving or transmitting a differential signal between the first and the second electronic devices, and for converting between a differential signal and a single-ended signal. The transmission wire is used for transmitting the single-ended signal. This allows the conversion between the received or transmitted differential signal at the first and second ports into the single-ended signal so as to allow the transmission of the single-ended signal within the transmission wire.