Folding Adaptive Equalizer for Multi-Rate Signal Loss Compensation
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Solution Overview
Problem
Existing adaptive equalizers face challenges in efficiently compensating for signal loss across varying cable lengths and data rates in data communication systems, as they require multiple stages and distinct gain boosting circuits for high-bandwidth and low-bandwidth signals, leading to increased complexity and power consumption.
Innovation Solution
A sequential folding multi-rate adaptive equalizer that uses a folding function to dynamically switch between high-bandwidth and low-bandwidth gain boosting circuits, allowing the same gain boosting circuits to handle both signal types by adjusting the transfer function based on the received signal characteristics, thereby reducing the need for additional low-bandwidth stages and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stages and distinct gain boosting circuits are used for high-bandwidth and low-bandwidth signals, then signal compensation performance is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal gain boosting circuit that can operate in multiple modes: high-bandwidth mode for short cable lengths and low-bandwidth mode for long cable lengths. The same physical circuit hardware is reused for both signal types through dynamic configuration, eliminating the need for separate distinct circuits and reducing overall device complexity while maintaining compensation performance.
Solution Approach 2:
The patent employs dynamic switching between different operational modes of the gain boosting circuit based on detected cable length characteristics. The circuit transitions between high-bandwidth and low-bandwidth configurations in real-time, allowing a single circuit to adaptively serve multiple functions that would traditionally require multiple static circuits.
2Reliability
If multiple stages and distinct gain boosting circuits are used for high-bandwidth and low-bandwidth signals, then signal compensation performance is improved, but power consumption increases
Solution Approach 1:
By making the gain boosting circuit universal and capable of operating in both high-bandwidth and low-bandwidth modes, the patent ensures that only one set of circuits needs to be active at any time. This eliminates the power consumption associated with running multiple parallel circuits simultaneously, while still providing the necessary compensation performance for different cable lengths.
Solution Approach 2:
The patent effectively discards the high-bandwidth configuration when processing low-bandwidth signals and recovers the circuit for low-bandwidth operation, and vice versa. This dynamic reconfiguration ensures that power is consumed only by the necessary circuit mode at any given time, reducing overall power consumption compared to having both modes permanently active.
3Reliability
If separate low-bandwidth stages are added, then low-bandwidth signal compensation is improved, but device complexity increases
Solution Approach 1:
The gain boosting circuit is designed to be universal, capable of providing optimized compensation for both high-bandwidth and low-bandwidth signals using the same hardware infrastructure. This eliminates the need to add separate dedicated low-bandwidth stages, as the existing circuit can be dynamically configured to handle low-bandwidth signals effectively.
4Adaptability or versatility
If the equalizer adapts to varying cable lengths and data rates, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic adaptability by enabling the gain boosting circuit to switch between different operational modes based on detected transmission conditions. This dynamic reconfiguration allows the system to adapt to varying cable lengths and data rates using a single flexible circuit architecture, rather than requiring multiple dedicated circuits for each condition, thereby improving adaptability without proportionally increasing complexity.
Solution Approach 2:
The equalizer adapts to different cable lengths and data rates by changing operational parameters of the gain boosting circuit, such as bandwidth settings and gain levels, rather than by physically reconfiguring the circuit topology. This parameter-based adaptation allows the system to handle multiple conditions with the same hardware, improving versatility without adding significant complexity.
Data Source
AI summary
A folding adaptive equalizer is provided. The equalizer comprises an equalizer core and an automatic gain control loop. The equalizing transfer function of the equalizer core is modulated by one or more gain control signals generated by the automatic gain control loop and by a folding signal generated by the automatic gain control loop. When the folding signal is inactive, an increase in the gain control signals produces an increase in the high-frequency, high-bandwidth gain of the transfer function of the equalizer core. When the folding signal is active, further gain can be applied by decreasing the gain control signals, which produces a frequency-shift in the transfer function of the equalizer core toward lower bandwidth and an increase in the high-frequency, low-bandwidth gain of the transfer function of the equalizer core.