Coupling Section Impedance Matching for Differential Signal Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing signal transmitting apparatuses in image forming systems face challenges in efficiently transmitting differential signals over electric power lines without causing impedance mismatch and reflected waves, which can lead to signal distortion and reduced reliability.
Innovation Solution
A signal transmitting apparatus with a coupling section that includes a conductive layer with openings to increase impedance in the coupling lines, allowing for the transmission of differential signals by branching off into multiple second lines, thereby reducing impedance mismatch and signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling section with standard width lines is used to branch signals, then the device complexity is reduced, but impedance mismatch occurs causing signal distortion and reflected waves
Solution Approach 1:
The coupling line width is locally increased at the coupling section compared to the first and second lines. This local structural change creates a specific impedance transformation zone that enables smooth signal transition between the power line and multiple second lines, preventing reflected waves while maintaining overall structural simplicity
Solution Approach 2:
The impedance parameter is changed at the coupling section by increasing the line width. This parameter change creates an impedance transformation zone that matches the impedance between the single power line and multiple second lines, eliminating impedance mismatch and ensuring reliable signal transmission
2Adaptability or versatility
If multiple second lines branch off from a single power line, then the adaptability of the system is improved, but impedance mismatch increases causing signal distortion
Solution Approach 1:
The coupling line width is increased to change the impedance parameter, creating an impedance transformation zone that smoothly transitions from the single power line impedance to the combined impedance of multiple second lines. This enables the system to adapt to multiple signal distribution scenarios while maintaining signal quality
Solution Approach 2:
The coupling section acts as an intermediary structure between the single power line and multiple second lines. The increased width creates a transition zone that mediates the impedance mismatch, enabling smooth signal distribution to multiple lines without causing reflected waves or signal distortion
Data Source
AI summary
A signal transmitting apparatus includes a first line that is provided in one of plural layers of a board and transmits a signal by superimposing the signal on an electric power line that supplies electric power; a coupling section in which the electric power line is coupled to the first line and the first line is branched; plural second lines that branch off in the coupling section and are provided in another layer different from the one layer; and a conductive layer that is provided between the one layer and the other layer. The conductive layer has an opening that encompasses the coupling section in plan view, and the coupling section has a coupling line that has a larger width than the first line and plural through-holes that connect the coupling line and the plural second lines through the opening of the conductive layer.