Closed-Loop Bus Layout for Signal Reflection Mitigation
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Solution Overview
Problem
Existing signal reflection mitigation systems in integrated circuits (ICs) connected on a Printed Wiring Board (PWB) require termination resistors to prevent voltage overshoot and undershoot, which increases the size, weight, and part count of the circuit.
Innovation Solution
A closed loop bus line configuration is used, where multiple ICs are connected without termination resistors, forming a U-shape with a closure line connecting the ends, thereby preventing signal reflections and reducing voltage overshoot and undershoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If termination resistors are used to prevent signal reflections, then signal integrity is improved, but circuit size, weight, and part count increase
Solution Approach 1:
The patent removes termination resistors from the circuit by implementing a closed-loop bus topology. The signal path forms a continuous loop that eliminates the need for external termination components, thereby reducing part count while maintaining signal integrity through the inherent symmetry of the loop structure
Solution Approach 2:
The patent transitions from a traditional linear bus topology to a closed-loop topology, adding a dimensional aspect to the signal path. This loop configuration provides alternative signal paths that naturally mitigate reflections without requiring additional termination components
2Reliability
If termination resistors are used to prevent signal reflections, then voltage overshoot and undershoot are reduced, but circuit complexity increases
Solution Approach 1:
The patent extracts the voltage stabilization function from external termination resistors and implements it through the closed-loop bus topology itself. The symmetric loop structure provides inherent voltage control, eliminating the need for additional circuit components and reducing overall circuit complexity
Solution Approach 2:
The closed-loop bus topology serves its own termination function through its geometric symmetry. The loop structure naturally provides the necessary impedance matching and voltage control without requiring external components, making the system self-sufficient
3Reliability
If termination resistors are used at each IC, then signal reflections are mitigated, but size and weight of the circuit increase
Solution Approach 1:
The patent removes all termination resistors from the circuit by using a closed-loop bus topology. This eliminates the physical components that contribute to circuit weight while maintaining signal reflection mitigation through the topological symmetry of the loop structure
Data Source
AI summary
A circuit can include a closed loop bus line having a plurality of connections. The circuit can include a plurality of integrated circuits disposed on the close loop bus line at a respective connection of the plurality of connections. One or more of the integrated circuits can be configured to drive a signal on the closed loop bus line. The closed loop bus line can be configured to prevent signal reflection. For example, in certain embodiments, there are no termination resistors at any of the terminations to reduce size, weight, and/or part count of the circuit.