Adaptive Equalizer Coefficient Control by Sampling Distribution Peaks
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Solution Overview
Problem
Conventional receiving devices with adaptive equalizers in high-speed interfaces consume significant power due to the use of numerous comparators and calculation circuits for controlling equalizer coefficients, leading to increased size and power consumption.
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 the equalizer coefficient by detecting peak values in the distribution of sampling results, reducing the need for complex dispersion calculations and power-consuming components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerous comparators and complex calculation circuits are used for controlling equalizer coefficients, then measurement precision and control accuracy are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent changes the measurement parameter from precise voltage level comparison to counting the number of times signal levels fall within specific ranges. This parameter transformation maintains measurement accuracy while dramatically simplifying the circuit structure, as counting operations require far fewer comparators and logic elements than traditional dispersion calculation methods
Solution Approach 2:
The patent extracts and eliminates the complex dispersion calculation circuit from the equalizer control system. By using a number counting part to simply tally signal level occurrences in different ranges, the patent removes the need for complicated mathematical computations while still achieving effective equalizer coefficient optimization
2Reliability
If numerous comparators and calculation circuits are provided for equalizer control, then control accuracy is improved, but power consumption increases
Solution Approach 1:
The patent replaces expensive, power-hungry comparator circuits with simpler, lower-power counting logic. The number counting part uses minimal computational resources to achieve the same control objective, significantly reducing power consumption while maintaining reliable equalizer coefficient optimization
Solution Approach 2:
By transforming the control methodology from continuous voltage comparison to discrete range counting, the patent reduces the computational burden and associated power consumption. The counting approach requires far less energy than maintaining multiple comparators and performing complex dispersion calculations in real-time
3Manufacturing precision
If complex dispersion calculation circuits are used, then manufacturing precision of signal processing is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent transforms the signal processing approach from precise continuous dispersion calculation to discrete range-based counting. This parameter change maintains sufficient processing precision for equalizer optimization while dramatically easing manufacturing, as the counting circuit is far simpler to design, layout, and fabricate than complex calculation circuits
Solution Approach 2:
By removing the complex dispersion calculation circuitry and replacing it with a simple number counting part, the patent significantly reduces manufacturing complexity. The extracted simplified circuit requires fewer transistors, less interconnect routing, and fewer design iterations, making the overall device easier and more cost-effective to manufacture
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.