Circuit Topology for Multiple Loads Using Branch Resistors
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Solution Overview
Problem
Conventional circuit topologies for multiple loads on a motherboard suffer from signal reflections, which compromise signal integrity due to varying signal travel distances and layouts, leading to instability and potential system breakdown.
Innovation Solution
A circuit topology with strategically placed resistors in branch transmission lines of varying lengths to manage signal strength and reduce reflections, featuring a driving terminal connected to nodes via main and branch transmission lines, with resistors in longer branch lines to adjust signal voltage and reduce overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a daisy-chain configuration is used to connect multiple receiving terminals, then the circuit topology can support multiple loads, but signal reflections and ringing occur due to varying signal travel distances
Solution Approach 1:
The patent applies local quality by placing resistors at specific locations (local positions) in the transmission lines - specifically at receiving terminals that are farther from the driving terminal. This localized modification allows the circuit to support multiple loads while maintaining signal integrity only where needed, rather than uniformly across all terminals.
Solution Approach 2:
The resistor acts as an intermediary element inserted into the transmission line between the driving terminal and receiving terminals. This intermediary component absorbs or dampens signal reflections, mediating the interaction between the transmission line and the receiving terminals to prevent ringing while allowing signal transmission to proceed.
2Ease of operation
If transmission lines of varying lengths are used to connect receiving terminals at different positions, then all terminals can be connected to the driving terminal, but signal reflections cause instability
Solution Approach 1:
The patent applies local quality by placing resistors at specific locations (local positions) in the transmission lines - specifically at receiving terminals that are farther from the driving terminal. This localized modification allows the circuit to support multiple loads while maintaining signal integrity only where needed, rather than uniformly across all terminals.
Solution Approach 2:
The resistor, which inherently dissipates energy, is used to convert the harmful effect of signal reflections into beneficial damping. By introducing controlled energy dissipation at strategic points, the harmful reflections that cause instability are transformed into a useful signal-damping mechanism that enhances system stability.
3Reliability
If resistors are added to transmission lines to reduce reflections, then signal integrity improves, but circuit complexity increases
Solution Approach 1:
The patent applies local quality by placing resistors at specific locations (local positions) in the transmission lines - specifically at receiving terminals that are farther from the driving terminal. This localized modification allows the circuit to support multiple loads while maintaining signal integrity only where needed, rather than uniformly across all terminals.
Solution Approach 2:
The patent applies partial action by not adding resistors to all receiving terminals, but only to those that are farther from the driving terminal and more prone to reflections. This selective approach achieves sufficient signal integrity improvement without the excessive complexity of uniformly adding resistors to every terminal.
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
The proposed topology effectively reduces signal reflections and enhances signal integrity across multiple receiving terminals by optimizing signal transmission, as evident from improved signal waveforms compared to conventional designs.
Implementation Method 1
a first resistor is connected in the second branch transmission line
Implementation Method 2
a first resistor is connected in the second branch transmission line... The second branch transmission line is longer than the first transmission line
Implementation Method 3
a second resistor is connected in the third branch transmission line... The third branch transmission line is longer than the fourth branch transmission line
Data Source
AI summary
A circuit topology for multiple loads includes a driving terminal, a first node coupled to the driving terminal via a main transmission line, a second node coupled to the first node via a first branch transmission line, a first receiving terminal coupled to the first node via a second branch transmission line, a third node coupled to the second node via a third branch transmission line, and a second receiving terminal coupled to the second node via a fourth branch transmission line. The second branch transmission line is longer than the first transmission line, and a first resistor is connected in the second branch transmission line. The third branch transmission line is longer than the fourth branch transmission line, and a second resistor is connected in the third branch transmission line.