DC Level Detection Circuit for High-Speed Signal Ports
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Solution Overview
Problem
Existing communication technologies face challenges in accurately determining the connection status of plug-in modules, especially in high-speed signal transmission scenarios, where traditional voltage-based detection methods are inadequate for multi-functional ports and can interfere with signal transmission.
Innovation Solution
A DC level detection circuit utilizing resistors and a low pass filter connected to high-speed signal lines, allowing for simultaneous signal transmission and connection status detection, ensuring compatibility with MSA standards and preventing adverse effects on low-level signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a special detection port is provided to check connection status, then connection detection capability is improved, but the port cannot be used for high speed signal transmission
Solution Approach 1:
The patent applies multi-functionality by enabling the high-speed signal port to serve dual purposes: transmitting high-speed signals and detecting connection status. The detection circuit uses the existing high-speed signal line to detect DC voltage levels, allowing the same port to perform both signal transmission and connection detection functions simultaneously, thereby eliminating the need for a separate dedicated detection port.
2Adaptability or versatility
If the detection port is used for high speed signal transmission, then port versatility is improved, but connection detection accuracy deteriorates
Solution Approach 1:
The patent introduces a detection circuit as an intermediary that monitors the DC voltage level on the high-speed signal line without interfering with the high-speed signal transmission. The detection circuit includes a detection resistor and voltage comparator that safely extract connection status information from the signal line, acting as a mediator between the signal transmission function and detection function.
3Measurement precision
If voltage detection is performed on the high speed signal line, then connection status can be determined, but signal transmission integrity may be compromised
Solution Approach 1:
The detection circuit performs partial action by only monitoring the DC voltage level component of the signal while leaving the high-speed AC signal transmission unaffected. The detection circuit uses high-impedance sampling and filtering to extract only the necessary DC connection status information without loading or distorting the high-speed signal, thus maintaining signal transmission 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
Enables reliable detection of connection status between plug-in modules and slots, maintaining high-speed signal transmission integrity and expanding port functionality without negative impacts on existing systems.
Implementation Method 1
a low pass filter, wherein one node of the low pass filter is connected to the signal detection port, and another node of the low pass filter is connected to the second port of the high speed signal line
Data Source
AI summary
A DC level detection circuit between high speed signal line connecting ports and a system using the same in optical communications is disclosed. Corresponding ports of a high speed signal line each have an additional resistor, where one additional resistor has a resistance significantly greater than that of the other resistor. The smaller resistor is grounded. The larger resistor is connected to a DC voltage source, a low pass filter, and a signal detection port. Thus, when both ports of the high speed signal line are connected, a status of the electrical level detected at the signal detection port changes. The circuit detects the connection state of the high speed signal line without negative effects on signal transmission and is applicable to various circuits, especially plug-in modules and corresponding slots. Thus, the circuit further enables signal port multifunctionality, increases module installation accuracy, and provides higher compatibility for plug-in modules.