Receiver Circuit Adaptive Equalization Signal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed data communication through restricted bandwidth channels often results in signal distortion due to factors like skin effect and dielectric loss, leading to degraded signal quality and inter-symbol interference.
Innovation Solution
A receiver circuit with an equalizer, clock data recovery circuit, and equalization control circuit that generates equalization signals, data clock and edge clock signals, and adjusts the equalization coefficient based on data and edge bits to perform adaptive equalization, reducing signal jitter and enhancing system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed data communication is performed through a communication channel, then data transmission speed increases, but signal distortion occurs due to skin effect and dielectric loss
Solution Approach 1:
The patent implements adaptive equalization by continuously monitoring signal quality metrics (such as eye diagram parameters or bit error rate) and dynamically adjusting equalization coefficients in response to detected signal distortion. This closed-loop feedback mechanism compensates for frequency-dependent losses caused by skin effect and dielectric loss, maintaining signal integrity at high transmission speeds.
Solution Approach 2:
The patent changes the equalization parameters (coefficients) dynamically based on the transmitted data pattern and channel conditions. By adjusting these parameters in real-time, the system compensates for signal distortion without requiring a reduction in transmission speed, thus resolving the contradiction between speed and signal quality.
2Reliability
If equalization is applied to compensate for signal distortion, then signal quality improves, but device complexity increases due to additional equalizer components
Solution Approach 1:
The patent employs dynamic equalization where the equalization coefficients are adjusted in real-time based on incoming signal characteristics rather than using fixed static equalization parameters. This dynamic approach allows the equalizer to adapt to changing channel conditions and data patterns, improving signal quality while potentially reducing the need for overly complex fixed-structure equalizers.
Solution Approach 2:
The equalization control circuit automatically adjusts equalization parameters based on intrinsic signal measurements without requiring external intervention or complex manual tuning. The system uses its own received signal to generate control decisions, making the equalization process self-regulating and reducing overall system complexity.
3Measurement precision
If adaptive equalization control is implemented by comparing data bits and edge bits, then equalization accuracy improves, but processing time increases
Solution Approach 1:
The patent performs equalization adjustments during idle periods or transition phases between data bursts, rather than during critical data sampling windows. By preparing equalization coefficients in advance or during non-critical periods, the system achieves accurate equalization without adding processing delays to the critical data path.
Solution Approach 2:
The adaptive equalization is performed periodically at optimized intervals rather than continuously for every bit. The system samples signal quality metrics at strategic moments (such as during training sequences or idle symbols) and updates coefficients periodically, maintaining accuracy while minimizing processing overhead and time loss.
Data Source
AI summary
A receiver circuit includes an equalizer configured to generate an equalization signal by equalizing an input data signal transferred through a communication channel based on an equalization coefficient; a clock data recovery circuit configured to generate a data clock signal and an edge clock signal based on the equalization signal, generate a data sample signal including a plurality of data bits by sampling the equalization signal in synchronization with the data clock signal, and generate an edge sample signal including a plurality of edge bits by sampling the equalization signal in synchronization with the edge clock signal; and an equalization control circuit configured to control the equalization coefficient by comparing the plurality of data bits and the plurality of edge bits.