Elliptical Bus Wiring Layout for Reflection-Free Signal Distribution
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Solution Overview
Problem
Existing signal transmission systems experience signal degradation and amplitude reduction due to multiple reflections when multiple receivers are connected to a single driver, particularly in bus wiring schemes with branch lines, as conventional methods using resistors on branch lines further reduce signal amplitude.
Innovation Solution
A signal transmission system utilizing an elliptically shaped wiring conductor with focal points, a ground conductor, and a termination circuit connected between the focal points, where receivers are connected to the conductor's outer or inner edge, ensuring signals are reflected once and absorbed by the termination circuit, preventing multiple reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a resistor is inserted on a branch line to reduce multiple reflections, then signal reflection is reduced, but the amplitude of signals decreases as the number of branch lines increases
Solution Approach 1:
The patent segments the termination function by providing individual termination resistors at each receiver location rather than using a single termination resistor. This allows each branch to be independently terminated, preventing multiple reflections while maintaining signal amplitude at each receiver.
Solution Approach 2:
The patent applies local quality by placing termination resistors specifically at locations where receivers are connected to the bus wiring. This targeted approach eliminates reflections at critical points without affecting the overall signal distribution across the entire bus system.
2Adaptability or versatility
If multiple receivers are connected to a single driver in a bus wiring scheme, then signal distribution to multiple devices is achieved, but signal quality is degraded due to multiple reflections
Solution Approach 1:
The patent segments the bus wiring into multiple independently terminated branches, each with its own termination resistor matched to the characteristic impedance. This segmentation prevents signal reflections at each branch point while maintaining the ability to distribute signals to multiple receivers.
Solution Approach 2:
The patent introduces termination resistors as intermediary elements at each receiver location. These resistors act as mediators that absorb reflected signals and prevent them from traveling back along the bus wiring, thereby maintaining signal quality while enabling multiple receivers.
Data Source
AI summary
A signal transmission system includes: a wiring conductor that is formed elliptically, and has two focal points; a GND conductor board disposed facing the wiring conductor; a driver connected between a first focal point of the wiring conductor and the GND conductor board; a plurality of receivers connected between the wiring conductor and the GND conductor board; and a termination circuit connected between a second focal point of the wiring conductor and the GND conductor board.