Parallel Transmission Lines with Varied Propagation Constants
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electrical circuits with multiple interconnected functional elements, timing synchronization is challenging due to varying interconnect lengths, leading to timing skew and performance reduction, as conventional methods either require adjusting interconnect lengths or adding passive devices, which are inefficient and costly.
Innovation Solution
The solution involves using interconnects with different lengths and structures, where the propagation constant is varied to equalize signal propagation times, allowing signals to traverse all interconnects in the same period, eliminating timing skew and mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interconnect lengths are adjusted to equalize propagation times, then timing synchronization is achieved, but layout flexibility and physical size are constrained
Solution Approach 1:
The patent applies local quality by varying the propagation constant in different segments of transmission lines based on their specific length requirements. Each transmission line is configured with tailored electrical characteristics (propagation constant, characteristic impedance) to compensate for its specific physical length, enabling timing synchronization without constraining overall layout flexibility.
Solution Approach 2:
The patent changes physical parameters of the transmission lines, specifically the propagation constant and characteristic impedance, to equalize propagation times. By adjusting these parameters rather than uniformly equalizing physical lengths, the system achieves timing synchronization while maintaining layout adaptability and physical size efficiency.
2Reliability
If multiple functional elements are designed with varying characteristics to compensate for different transmission distances, then timing skew is eliminated, but design time and cost increase
Solution Approach 1:
The patent systematically varies parameters (propagation constant, characteristic impedance) of transmission lines to compensate for different lengths. This parameter-based approach eliminates timing skew while maintaining design efficiency, as it provides a scalable methodology that can be applied across multiple functional elements without requiring complete redesign of each element.
Solution Approach 2:
The patent creates a universal transmission line design methodology that can be applied to multiple functional elements with different transmission distances. By establishing a systematic approach to parameter adjustment, the solution eliminates timing skew across the entire system without requiring separate custom designs for each functional element pair.
3Reliability
If passive devices are added to control signal characteristics, then signal propagation is adjusted, but component count and signal loss increase
Solution Approach 1:
The patent extracts the signal propagation control function from separate passive devices and integrates it directly into the transmission line structure itself. By incorporating the required electrical characteristics (propagation constant, characteristic impedance) into the transmission line design, the system achieves signal propagation control without adding external passive components, thereby reducing component count and signal loss.
Solution Approach 2:
The patent merges the signal propagation control function with the transmission line structure. Instead of using separate passive devices to control signal characteristics, the transmission line itself is designed with the appropriate electrical characteristics, combining multiple functions into a single integrated structure that reduces overall system complexity.
Data Source
AI summary
A signal bus includes multiple interconnects for transporting electronic signals. The interconnects have different physical path lengths and different structures to equalize the different the physical path lengths, so that the electronic signals traverse the corresponding interconnects in same period of time.