Coaxial Bidirectional Data Link Without Replica Cancellation Circuits
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Solution Overview
Problem
Existing bidirectional communication links that share a single-ended coaxial medium face challenges in distinguishing and processing data traveling in opposite directions, especially at high data rates, due to the complexity and power requirements of replica circuits used in active cancellation methods.
Innovation Solution
A bidirectional data link circuitry that includes a forward channel transmitter and receiver, utilizing a summation circuit and active filter to extract back channel data from the single-ended medium, without the need for replica circuits, allowing simultaneous bidirectional signaling with high forward channel rates (>3 Gb/s) and lower back channel rates (about 300 Mb/s) on a single-ended coaxial cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active cancellation methods using replica circuits are used to distinguish bidirectional data, then data direction distinction is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts and removes the complex replica circuits from the system by using a different approach - summing the forward and backward channels directly to distinguish data directions without needing complex cancellation circuits. This eliminates the harmful complexity while maintaining the ability to distinguish bidirectional data.
Solution Approach 2:
The patent introduces a summation circuit as an intermediary that combines the forward and backward channels in a controlled manner. This intermediary allows the system to distinguish data directions through controlled summing and filtering rather than through complex replica circuits, thereby reducing device complexity while maintaining reliability.
2Reliability
If active cancellation methods using replica circuits are used to distinguish bidirectional data, then data direction distinction is improved, but power consumption increases
Solution Approach 1:
The patent extracts and removes the power-consuming replica circuits by replacing them with a simpler summation and filtering approach. This eliminates the harmful power consumption while maintaining the ability to distinguish bidirectional data through controlled signal processing.
Solution Approach 2:
The patent introduces a summation circuit as an intermediary that combines channels with lower power consumption than replica circuits. This intermediary enables data direction distinction through controlled summing and filtering, reducing power consumption while maintaining reliability.
3Productivity
If high data rates are used in forward channel, then productivity is improved, but noise and interference increase
Solution Approach 1:
The patent segments the communication channels into forward and backward components and processes them differently through controlled summing and filtering. This segmentation allows high-speed forward transmission while using filtering to remove noise and interference from the backward channel, maintaining productivity while reducing harmful factors.
Solution Approach 2:
The patent introduces filtering circuits as intermediaries that process the summed channels to remove noise and interference. These intermediaries enable the system to maintain high forward channel data rates while actively suppressing noise and harmful factors through frequency-selective filtering.
Data Source
AI summary
A bidirectional data link includes a forward channel transmitter circuit and a forward channel receiver circuit. The forward channel transmitter circuit includes a forward channel driver circuit, and a back channel receiver circuit. The back channel receiver circuit is coupled to the forward channel driver circuit. The back channel receiver circuit includes a summation circuit and an active filter circuit. The summation circuit is coupled to the forward channel driver circuit. The active filter circuit is coupled to the summation circuit. The forward channel receiver circuit includes a forward channel receiver, and a back channel driver circuit. The back channel driver circuit is coupled to the forward channel receiver.