Runtime-Adjustable Cable Attenuator for Reflection Damping
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Solution Overview
Problem
Existing information handling systems face challenges in dynamically adjusting transmission line loss to minimize reflections and maintain optimal signal transmission across varying conditions such as temperature and humidity changes, especially in short channels where low-loss materials do not effectively dampen reflections and crosstalk.
Innovation Solution
A computing cable with a trace and an attenuator comprising a fixed resistor, a variable resistor, and a conductor, where the first resistance is dynamically varied based on a control input to adjust attenuation in real-time, compensating for environmental changes and part-to-part variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low-loss materials are used in short channels, then signal transmission loss is reduced, but reflections and crosstalk are not effectively dampened
Solution Approach 1:
The patent applies local quality by placing an attenuator at a specific location within the transmission line (between trace segments) to provide localized signal conditioning. This attenuator with dynamically adjustable resistance targets the specific problem of reflections and crosstalk in short channels without affecting the overall low-loss material properties of the transmission line.
Solution Approach 2:
The patent implements parameter changes by using a variable resistor component within the attenuator that can dynamically adjust its resistance value. This allows the attenuation characteristic to be changed in real-time based on operating conditions, temperature, and humidity, thereby optimizing the damping of reflections and crosstalk while maintaining signal transmission quality.
2Ease of manufacture
If fixed attenuation is used, then manufacturing is simplified, but adaptation to environmental changes and part-to-part variations is lost
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed attenuation design to a dynamically adjustable attenuator. The variable resistor component allows the attenuation value to be modified after manufacturing, enabling the system to adapt to environmental changes, temperature variations, and part-to-part differences while maintaining the relatively simple structure of the attenuator circuit.
Solution Approach 2:
The patent implements feedback by using a control input that responds to environmental conditions and signal characteristics to dynamically adjust the variable resistor value. This feedback mechanism allows the attenuator to automatically compensate for environmental changes and maintain optimal performance without complex manufacturing requirements.
3Reliability
If dynamic adjustment of resistance is implemented, then signal transmission is optimized under varying conditions, but device complexity increases
Solution Approach 1:
The patent applies dynamics by using a variable resistor component that can change its resistance value dynamically in response to control inputs. This dynamic adjustment optimizes signal transmission under varying environmental conditions while maintaining a relatively simple attenuator structure consisting of basic electrical components rather than complex mechanical or electronic systems.
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 dynamic adjustment of transmission line loss effectively minimizes reflections and maintains optimal signal transmission by calibrating the resistance to environmental changes, ensuring consistent performance across varying conditions.
Implementation Method 1
an attenuator that includes a fixed resistor having a second resistance, a variable resistor having a first resistance, and a conductor having a second impedance. The combination of the first resistance, the second resistance, and the second impedance is based on the first impedance, wherein the first resistance is varied dynamically at runtime based on a control input.
Data Source
AI summary
A computing cable comprising a trace having a first impedance and an attenuator that includes a fixed resistor having a second resistance, a variable resistor having a first resistance, and a conductor having a second impedance. The combination of the first resistance, the second resistance, and the second impedance is based on the first impedance, wherein the first resistance is varied dynamically at runtime based on a control input.