Adaptive Reference Voltage Generator for High Channel Loss Equalizers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional decision feedback equalizers using sign-sign least mean square (SSLMS) algorithms face challenges in adapting reference voltages, which are typically fixed or manually adjustable, and struggle to operate effectively under high channel loss conditions.
Innovation Solution
A reference voltage generator that includes a detecting voltage provider, comparator, and core circuit to dynamically adjust reference voltages based on sampled amplitudes of an input signal, determining boundary voltage coefficients to generate accurate reference voltages for the equalizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed reference voltage is used in the SSLMS algorithm circuit, then the circuit structure is simple, but the equalizer cannot adapt to varying channel conditions and different input signal levels
Solution Approach 1:
The reference voltage is transformed from a fixed value to a dynamically adjustable parameter. The patent implements a reference voltage generator that automatically adjusts the reference voltage based on the statistical characteristics of the input signal, enabling the equalizer to adapt to varying channel conditions while maintaining a relatively simple circuit structure through automated control.
Solution Approach 2:
The patent introduces a feedback mechanism where the equalizer monitors the output signal quality and automatically adjusts the reference voltage accordingly. The control unit receives feedback about signal characteristics and modifies the reference voltage to optimize performance, creating a closed-loop system that adapts to changing conditions.
2Adaptability or versatility
If an analog circuit is used to automatically search for optimized reference voltage, then adaptability is improved, but the circuit cannot operate under high channel loss data conditions
Solution Approach 1:
The patent replaces the analog circuit approach with a digital implementation. The reference voltage generator uses digital signal processing and logical control to search for and establish the optimized reference voltage. This digital approach maintains reliability under high channel loss conditions while achieving automatic adaptation, overcoming the limitations of analog-based solutions.
3Adaptability or versatility
If the reference voltage is manually adjustable, then some adaptability is achieved, but the adjustment process is complex and time-consuming
Solution Approach 1:
The patent implements a self-adjusting reference voltage generator that automatically determines the optimal reference voltage without requiring manual intervention. The system independently analyzes the input signal characteristics and configures the appropriate reference voltage level, eliminating the complexity and time consumption associated with manual adjustment while maintaining full adaptability.
Data Source
AI summary
A reference voltage generator includes a detecting voltage provider, a comparator, and a core circuit. The detecting voltage provider provides a detecting voltage with a first voltage level corresponding to a voltage coefficient. The comparator compares the first voltage level of the detecting voltage with a plurality of sampled amplitudes of an input signal to respectively generate a plurality of comparison results. The core circuit is used to: collect a plurality of first comparison results associated with a current received bit of a preset value from the comparison results; take the voltage coefficient as a first boundary voltage coefficient in response to the first comparison results satisfying a first condition; take the voltage coefficient as a second boundary voltage coefficient in response to the first comparison results satisfying a second condition. The reference circuit generates a reference voltage according to the first and second boundary voltage coefficients.