Dual Equalizer Tuning for Multi-Spec Signal Receivers
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Solution Overview
Problem
Adaptive equalizers designed for specific high-speed signal transmission specifications perform poorly when used with different transmission specifications, due to varying degrees of attenuation and distortion caused by factors like cable material and length, requiring dedicated designs for each environment and specification.
Innovation Solution
A signal receiving device with a dual equalizer system and an equalization controller that adjusts both equalization parameters simultaneously, using pattern symbols to optimize signal compensation and achieve compatibility with multiple transmission specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an adaptive equalizer is dedicately designed for a specific transmission specification, then the signal compensation performance for that specification is improved, but the compatibility with other transmission specifications deteriorates
Solution Approach 1:
The patent implements a dual equalizer architecture where a first equalizer handles coarse compensation and a second equalizer handles fine compensation. This multi-functional design allows the system to adapt to different transmission specifications (HDMI, DP, USB Type-C) by adjusting which equalizer is primarily used, rather than requiring separate dedicated equalizers for each specification.
Solution Approach 2:
The equalization function is segmented into two independent equalizers with different parameter sets. The first equalizer uses first equalization parameters for initial compensation, while the second equalizer uses second equalization parameters for refined compensation. This segmentation allows flexible combination and independent optimization for different transmission standards.
2Measurement precision
If separate tuning mechanisms are used for different transmission specifications, then the optimization accuracy for each specification is improved, but the tuning time and system complexity increase
Solution Approach 1:
The patent merges the tuning processes of both equalizers into a single unified tuning operation. The equalization controller simultaneously adjusts both first equalization parameters and second equalization parameters during one tuning phase, eliminating the need for sequential tuning and reducing overall lock time while maintaining optimization accuracy.
Solution Approach 2:
The first equalizer performs preliminary coarse compensation to establish a baseline signal quality, which prepares the signal for more precise fine compensation by the second equalizer. This preliminary action enables the second equalizer to converge faster to optimal parameters without starting from scratch.
Data Source
AI summary
A signal receiving device and an equalizer tuning method thereof are provided. A first equalizer receives an input signal and generates a first equalized signal by compensating the input signal according to a first equalization parameter. A second equalizer generates a second equalized signal by compensating the first equalized signal according to a second equalization parameter. A clock and data recovery circuit recovers the second equalized signal to generate an output signal. An equalizing controller receives the input signal and outputs a first control signal and a second control signal, to adjust the first equalization parameter according to the first control signal and adjust the second equalization parameter according to the second control signal. The equalizing controller detects a first pattern symbol and a second pattern symbol from the output signal and tunes the second equalization parameter according to the number of the first pattern symbol and the second pattern symbol.