Embedded Clock Recovery Using Delay-Selected Mask Signals
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Solution Overview
Problem
Existing methods for recovering a clock signal from an interface signal face challenges due to electromagnetic interference (EMI), data sampling errors, and spatial arrangement issues when clock and interface signals are transmitted over separate lines, and inaccuracies in mask signal generation leading to incorrect clock extraction.
Innovation Solution
A clock recovery device that includes a mask signal selecting unit, a mask signal generating unit, and a time-delay controlling unit to accurately recover the clock signal by comparing delayed mask rising signals with the clock signal, generating a mask signal, and adjusting time delays to synchronize data clock signals, thereby ensuring precise clock extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signal and interface signal are transmitted through separate lines, then clock signal transmission is reliable, but electromagnetic interference occurs and spatial arrangement problems arise
Solution Approach 1:
The patent combines the clock signal and interface signal into a single transmission line by embedding the clock signal within the interface signal timeline. The clock signal is transmitted during specific time periods (e.g., horizontal synchronization period, vertical synchronization period, or data period) within the same physical channel, eliminating the need for separate transmission lines and thereby resolving electromagnetic interference and spatial arrangement issues while maintaining transmission reliability.
2Ease of operation
If mask signal generation circuit processes signals through logic circuits, then mask signal is generated, but processing delay causes inaccurate indication of clock signal time period
Solution Approach 1:
The patent applies preliminary action by pre-calculating and compensating for the logic circuit processing delay when generating the mask signal. The mask signal generation circuit incorporates a delay compensation mechanism that anticipates the processing delay and adjusts the mask signal timing accordingly, ensuring that the mask signal accurately indicates the actual time period of the embedded clock signal despite the inherent processing delay in the logic circuits.
Data Source
AI summary
In generating a mask signal used to recover a clock signal embedded in an interface signal, the mask signal may be generated by comparing a plurality of comparison signals, generated by delaying a plurality of mask rising signals by a predetermined time, with the clock signal and selecting one mask rising signal used to generate a comparison signal close to one portion of the clock signal from among the plurality of mask rising signals.