Jitter Negation in High Speed Serial Interfaces
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Solution Overview
Problem
High speed serial interfaces face challenges in maintaining signal integrity due to deviations from true periodicity, such as random and deterministic jitter, which affect bit error rate and power consumption.
Innovation Solution
A serial data channel with a transmitter and receiver that includes a jitter generator and eye detector, which evaluates and adjusts jitter settings to optimize signal quality by injecting timing delays and selecting the best settings for reduced power consumption while maintaining acceptable bit error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If jitter settings are increased to compensate for signal deviations, then signal integrity is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts jitter settings based on real-time signal quality feedback from the eye detector. The transmitter modifies jitter parameters adaptively rather than using fixed settings, allowing optimization of signal integrity while minimizing unnecessary power consumption from excessive jitter compensation.
Solution Approach 2:
The eye detector provides feedback about signal eye quality to the jitter generator, creating a closed-loop control system. This feedback mechanism enables the system to adjust jitter settings only when and to the extent needed to maintain acceptable signal integrity, avoiding wasteful power consumption from constant maximum jitter injection.
2Reliability
If jitter settings are adjusted to reduce bit error rate, then reliability is improved, but device complexity increases
Solution Approach 1:
The eye detector serves multiple functions: it evaluates signal eye quality, determines bit error rate performance, and provides feedback for jitter optimization. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving improved bit error rate through jitter adjustment.
3Productivity
If multiple jitter settings are evaluated to optimize performance, then channel performance is improved, but measurement precision requirements increase
Solution Approach 1:
The system evaluates multiple jitter settings but selects an acceptable optimum rather than seeking absolute perfection. The eye detector identifies sufficient signal eye opening margins without requiring ultra-precise measurement at the theoretical optimum point, reducing measurement precision requirements while still achieving optimized channel performance through comparative evaluation of multiple settings.
Data Source
AI summary
A serial data channel includes a transmitter with a jitter generator that receives a jitter setting and injects a timing delay into an output signal of the transmitter in response to the jitter setting. The serial data channel further includes a receiver with an eye detector configured to evaluate a signal eye of the received output signal. The serial data channel provides a plurality of jitter settings to the jitter generator, and evaluates a plurality of signal eyes of the received output signal, where each signal eye of the plurality of signal eyes being associated with a particular received output signal generated in response to a particular one of the plurality of jitter settings. The serial data channel further selects a particular jitter setting of the plurality of jitter settings based upon the evaluation of the associated received output signal.