Computing Cable Attenuator With Dynamic Loss Adjustment
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Solution Overview
Problem
Information handling systems face challenges in dynamically adjusting transmission line loss, particularly at shorter distances where low-loss materials do not effectively dampen reflections and crosstalk, and variations in environmental conditions like temperature and humidity affect signal transmission.
Innovation Solution
A computing cable with a trace and an attenuator comprising a fixed resistor, a variable resistor, and a conductor, where the resistance is dynamically adjusted based on a control input to simulate changes in cable length and minimize reflections without excessive loss, using a combination of FET or MOSFET switches and digital control inputs to calibrate and compensate for environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low-loss materials are used in transmission lines, then signal loss is reduced, but reflections and crosstalk are not effectively dampened at shorter distances
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the resistance value of the attenuator based on cable length and environmental conditions. The system changes the attenuation parameter to optimize signal transmission, reducing reflections and crosstalk while maintaining acceptable signal loss levels across varying operating conditions.
Solution Approach 2:
The patent introduces an attenuator as an intermediary component between the trace and the load. This attenuator acts as a mediator that actively manages signal integrity by dampening reflections and crosstalk, which low-loss materials alone cannot effectively control at shorter distances.
2Reliability
If fixed attenuation is used to reduce reflections, then signal integrity improves, but excessive loss occurs in shorter cable runs
Solution Approach 1:
The patent implements dynamics by transitioning from fixed attenuation to dynamic attenuation adjustment. The system continuously adapts the attenuation level based on real-time conditions such as cable length measurements and environmental sensors, ensuring optimal signal integrity without excessive loss for each specific operating scenario.
Solution Approach 2:
The system changes the attenuation parameter dynamically based on measured cable length and environmental conditions. By adjusting this parameter in response to varying conditions, the system maintains signal integrity while minimizing unnecessary signal loss that would occur with fixed attenuation values.
3Device complexity
If environmental variations are not compensated, then device complexity remains low, but transmission reliability deteriorates under varying temperature and humidity
Solution Approach 1:
The patent applies feedback by incorporating environmental sensors that monitor temperature and humidity conditions. This feedback mechanism allows the system to detect environmental variations and automatically adjust the attenuation level to compensate for their effect on signal transmission, thereby maintaining reliability without requiring overly complex control mechanisms.
Solution Approach 2:
The system performs self-service by automatically measuring cable length and environmental conditions, then autonomously adjusting the attenuation setting without requiring manual intervention. This self-adjusting capability maintains transmission reliability under varying conditions while keeping the control mechanism relatively simple.
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
This solution allows for dynamic adjustment of transmission line loss, reducing reflections and maintaining signal integrity across varying conditions, thereby enhancing the reliability and efficiency of high-speed signal transmission in information handling systems.
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
Implementation Method 2
using a combination of FET or MOSFET switches and digital control inputs to calibrate and compensate for environmental changes
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.