SERDES Transmission Line Compensation for Channel Length Variation
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Solution Overview
Problem
High-speed data transmission in backplane and interconnect applications faces issues due to channel length variations, leading to co-channel interference and electromagnetic interference, which affect the bit error rate (BER) of SERDES communication systems.
Innovation Solution
A signal compensation method is implemented in SERDES communication systems by monitoring data signal quality using BER or eye quality algorithms, adjusting transmission line delay, and comparing it to a threshold until the signal quality meets the required standards, utilizing a transmission line compensation circuit with adjustable segments and switches to modify the transfer function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel data transmission is used in backplane applications, then data transmission capacity is improved, but co-channel interference and electromagnetic interference increase
Solution Approach 1:
The patent segments parallel data transmission into multiple serial lanes, where each lane transmits data independently. This segmentation reduces interference between channels while maintaining overall transmission capacity through parallel serialization.
Solution Approach 2:
The patent introduces SERDES devices as intermediary components that convert parallel data to serial format for transmission and back to parallel format at the receiving end. This intermediary conversion process eliminates direct parallel signal interference while preserving data transmission capabilities.
2Adaptability or versatility
If transmission channel length varies, then system adaptability is improved, but signal quality and bit error rate deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of transmission line delay through adjustable delay elements that can be configured based on the actual transmission channel length. This dynamic compensation maintains signal integrity across varying channel lengths by adjusting the delay to match the transmission characteristics.
Solution Approach 2:
The patent changes the delay parameter of the transmission line to compensate for variations in channel length. By adjusting the delay parameter dynamically, the system maintains optimal signal quality and bit error rate performance across different transmission distances.
3Reliability
If transmission line delay is adjusted to compensate for channel length variation, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the delay compensation function into multiple adjustable delay elements that can be independently controlled. This segmentation allows for fine-grained adjustment of the total delay while using standardized, modular components that reduce overall circuit complexity.
Solution Approach 2:
The patent uses dynamically controllable delay elements that can be adjusted based on detected channel characteristics. This dynamic approach allows a single circuit design to handle multiple channel length scenarios, reducing the need for multiple fixed-delay circuits and thereby simplifying the overall device complexity.
Data Source
AI summary
Described embodiments provide a method and system for signal compensation in a SERDES communication system that includes monitoring the quality of a data signal after passing through a transmission channel. The quality of the data signal is monitored with at least one of a BER calculation algorithm and a received eye quality monitoring algorithm. Variations in channel length of the transmission channel are compensated for by i) adjusting a length of transmission line delay of the data signal from the transmission channel, ii) comparing the data signal quality with a threshold for the adjusted data signal; and iii) repeating i) and ii) until the data signal quality meets the threshold.