Adaptive Equalizer Coefficient Tuning by Peak Sample Counting
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Solution Overview
Problem
Conventional receiving devices with adaptive equalizers in high-speed interfaces require numerous comparators and calculation circuits for controlling equalizer coefficients, leading to high power consumption and complex designs.
Innovation Solution
A receiving device with a simplified equalizer controlling circuit that uses a number counting part, zone scanning part, coefficient altering part, peak detecting part, and coefficient specifying part to optimize equalizer coefficients based on peak values of sampling results, reducing the need for dispersion calculations and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerous comparators and calculation circuits are provided for controlling equalizer coefficients, then equalization precision is improved, but power consumption increases
Solution Approach 1:
The patent extracts and removes the complex dispersion calculation circuit from the equalizer control system. Instead of using numerous comparators and calculation circuits for dispersion calculation, the invention uses a simplified peak detection method that only requires counting sampling results, thereby reducing power consumption while maintaining equalization precision
Solution Approach 2:
The patent replaces expensive, power-consuming calculation circuits with simpler, lower-cost counting circuits. The number counting part that counts sampling results is much simpler and consumes less power than the traditional dispersion calculation circuits, achieving the same control objective with reduced complexity
2Measurement precision
If numerous comparators and calculation circuits are provided for controlling equalizer coefficients, then equalization precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the complex dispersion calculation circuit from the equalizer control system. Instead of using numerous comparators and calculation circuits for dispersion calculation, the invention uses a simplified peak detection method that only requires counting sampling results, thereby reducing power consumption while maintaining equalization precision
Solution Approach 2:
The patent uses a simplified counting approach that copies the essential function of dispersion calculation without requiring the complex original circuit. By counting the number of sampling results directly, the system achieves the same control objective with much simpler circuitry
3Use of energy by moving object
If a simplified equalizer controlling circuit is used, then power consumption is reduced, but equalization precision may deteriorate
Solution Approach 1:
The patent changes the control parameter from dispersion value (requiring complex calculation) to peak detection value (requiring simple counting). This parameter change maintains the ability to optimize equalizer coefficients while dramatically reducing circuit complexity and power consumption
Solution Approach 2:
The patent implements a feedback mechanism where the number counting part counts sampling results, the peak detecting part identifies the peak count, and this feedback is used to adjust the equalizer coefficients. This closed-loop feedback ensures precise equalization control despite the simplified circuit architecture
Data Source
AI summary
To optimize an adaptive equalizer with a simple controlling circuit, the receiving device includes a number counting part counting, in a range of detection having a predetermined width, a sampling result corresponding to the input signal being shaped by an equalizer circuit at a determination timing indicated by a clock signal obtained in a CDR circuit, a zone scanning part scanning the range of detection in a scanning zone including a variation range of the input signal; a coefficient altering part altering an equalizer coefficient set to the equalizer circuit; a peak detecting part detecting a peak value of a number of appearances of the sampling result according to alteration of the equalizer coefficient and scanning of the range of detection; and a coefficient specifying part specifying the equalizer coefficient being used when detecting the peak value in the peak detecting part as a first coefficient.