Timing Skew Compensation Circuit Using Statistical Signal Analysis
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Solution Overview
Problem
Electronic devices face sampling timing errors due to timing skew in clock and data recovery circuits, leading to bit errors in received data, as signal delays for data and clock signals differ, causing synchronization issues.
Innovation Solution
An electronic circuit that compensates for timing skew by using statistical characteristics of sampled signals, employing a delay circuit, sampler, timing skew estimation circuit, and controller to estimate and correct the skew without a training operation, using multiple loops with varying timing delays to determine optimal sampling timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a clock and data recovery circuit is used to reduce communication channel complexity and improve communication speed, then communication efficiency is improved, but sampling timing errors occur due to timing skew between data and clock signals
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects timing skew between data and clock signals by comparing the timing of received data with the recovered clock signal. The detected timing skew information is fed back to adjust the sampling timing, creating a closed-loop system that continuously corrects sampling timing errors to maintain accurate data recovery despite signal path delays
Solution Approach 2:
The patent changes the sampling timing parameter dynamically based on detected timing skew. By adjusting the sampling instant relative to the clock signal based on measured timing differences, the system adapts to varying delay conditions in the communication channel, resolving the contradiction between maintaining high communication speed and ensuring accurate sampling timing
2Adaptability or versatility
If different signal delays are applied to data and clock paths, then signal transmission flexibility is improved, but timing synchronization deteriorates causing sampling timing errors
Solution Approach 1:
The patent performs preliminary timing skew detection and compensation before actual data sampling. By measuring the timing difference between data and clock signals in advance and pre-adjusting the sampling timing, the system prepares for potential synchronization issues before they affect data recovery, maintaining reliability while allowing transmission flexibility
Data Source
AI summary
An electronic circuit converts a receive signal being analog into reception data being digital. The electronic circuit includes a delay circuit that receives a first receive signal and outputs a reference signal, the reference signal being generated by delaying the first receive signal as much as one of a plurality of different timing delays respectively set to a plurality of loops, a sampler that receives a second receive signal and samples the second receive signal based on the reference signal in each of the plurality of loops, a timing skew estimation circuit that outputs a compensation signal for compensating for a timing skew by extracting a statistical characteristic of a plurality of sample data sampled through the sampler and estimating the timing skew based on the statistical characteristic, and a controller that controls an operation of the timing skew estimation circuit.