Receiver Training Signal Selector for High-Speed Link Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional transmitting and receiving systems using CDR technology require an additional communication link for a lock signal, which increases costs and complexity, especially in high-speed data transmission where frequency synchronization issues are prevalent.
Innovation Solution
A receiver and transmitting system that integrates a recovery circuit, a training signal generator, and a selector to manage the transmission of signals, allowing for the elimination of the lock signal communication link by switching between training and data signals based on synchronization status, reducing the number of communication links needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate communication link for lock signal is provided in conventional CDR systems, then frequency synchronization can be achieved, but the number of communication links increases and system complexity increases
Solution Approach 1:
The patent combines the lock signal transmission with the existing data signal transmission by superimposing the lock signal on the data signal in the time domain. This merging approach allows both signals to share the same communication link, eliminating the need for a separate lock signal link and reducing overall system complexity while maintaining synchronization reliability
Solution Approach 2:
The communication link is designed to serve multiple functions simultaneously: it transmits both the primary data signal and the lock signal for frequency synchronization. This multi-functionality approach allows a single communication link to perform what previously required separate dedicated links, reducing the total number of communication channels needed
2Reliability
If a separate communication link for lock signal is provided, then frequency synchronization can be maintained, but system cost increases due to additional converters and bandwidth requirements
Solution Approach 1:
By merging the lock signal transmission with the data signal transmission on the same communication link, the patent eliminates the need for additional converters and reduces bandwidth requirements. This consolidation directly reduces system cost by removing redundant hardware components that would be necessary if separate links were used
Solution Approach 2:
The communication link is designed to serve multiple functions simultaneously: it transmits both the primary data signal and the lock signal for frequency synchronization. This multi-functionality approach allows a single communication link to perform what previously required separate dedicated links, reducing the total number of communication channels needed
3Adaptability or versatility
If clock sources are used in both transmitter and receiver, then independent operation is enabled, but timing deviations accumulate over time causing bit errors
Solution Approach 1:
The patent implements a feedback mechanism where the receiver extracts the clock signal from the transmitted data signal and uses it to generate a lock signal that indicates synchronization status. This feedback loop allows the receiver to maintain independent operation while ensuring timing accuracy by continuously monitoring and reporting synchronization state to the transmitter
Solution Approach 2:
The transmitter embeds the clock signal within the data signal before transmission. This preliminary action ensures that the receiver can extract and synchronize to the correct timing information before any timing deviations accumulate, preventing bit errors while allowing independent operation
Data Source
AI summary
A transmitter 10B always transmits a signal (data in which a dock is embedded) generated by the serializer 11 to the communication link. The receiver 20B includes a recovery circuit 22, a deserializer 23, a selector 25, and a training signal generator 32. The training signal generator 32 generates and outputs a training signal for frequency synchronization of the recovering operation of the recovery circuit 22. The selector 25 receives the signal from the transmitter 10B via the communication link and receives the training signal output from the training signal generator 32. The selector 25 selects and outputs either the received signal or the training signal according to the level of the lock signal output from the recovery circuit 22.