Adaptive Signal Compensation Using CDR-Based Equalizer Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing signal communication systems face challenges in maintaining consistent output characteristics across different communication paths due to attenuation from phenomena like skin effect and dielectric absorption, and they often require dedicated monitor circuits that increase complexity and power consumption.
Innovation Solution
A method that adjusts compensation for signal distortion using output signal values generated by existing clock and data recovery functionality, allowing for adaptive equalization without a dedicated monitor circuit, and uses variable gain amplifiers to adapt to different media and temperature variations, while also addressing residual DC offset and inter-symbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated monitor circuit is used to adjust compensation, then measurement precision of signal characteristics is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent reuses existing clock and data recovery (CDR) circuitry to perform dual functions: its original function of clock recovery and an additional function of monitoring signal characteristics for equalizer adjustment. This eliminates the need for a dedicated monitor circuit while maintaining measurement capability.
Solution Approach 2:
The existing CDR functionality serves itself by also performing signal monitoring duties. The same circuit components that recover the clock signal are utilized to detect signal characteristics, making the system self-sufficient and reducing overall circuit complexity.
2Measurement precision
If a dedicated monitor circuit is used to adjust compensation, then measurement precision of signal characteristics is improved, but power consumption increases
Solution Approach 1:
The patent reuses existing clock and data recovery (CDR) circuitry to perform dual functions: its original function of clock recovery and an additional function of monitoring signal characteristics for equalizer adjustment. This eliminates the need for a dedicated monitor circuit while maintaining measurement capability.
Solution Approach 2:
Instead of adding a new dedicated monitor circuit, the patent recovers and reuses the functionality of existing CDR components for the additional purpose of signal monitoring, thereby avoiding additional power consumption.
3Adaptability or versatility
If equalizer compensation is adjusted for different communication media, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of equalizer compensation parameters based on detected signal characteristics. The system continuously monitors signal quality metrics and adapts the equalization parameters in real-time to match the specific characteristics of the communication medium being used.
Solution Approach 2:
The system uses feedback from the signal monitoring process to automatically adjust equalizer parameters. The detected signal characteristics feed back into the equalizer control mechanism, enabling automatic adaptation to different media without requiring complex manual configuration or multiple fixed-mode circuits.
Data Source
AI summary
In one embodiment of the present invention, a method for adjusting a signal includes applying compensation for distortion to a signal to generate an output signal. The method also includes, using a clock signal, sampling the output signal to generate a plurality of data values and boundary values, each value comprising either a high value or a low value based on the sampling of the output signal. The method further includes detecting a transition in value between two successive data values and determining a sampled boundary value between the two successive data values. The method also includes, based only on the high or low values of the boundary value and one or more data values before or after the boundary value, adjusting the compensation applied to the signal.