Clock Edge Interpolation for Data Eye Centering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing clock recovery systems face challenges in accurately aligning clock signals with data signals due to timing errors introduced during transmission, particularly due to integral non-linearity of delay elements, which affects power efficiency and design flexibility.
Innovation Solution
A clock interpolation system using a main delay and sensor delay subsystems to calibrate clock edges, eliminating timing errors by interleaving comparisons and adjusting delays to align the clock signal midpoint with the data eye, thereby improving timing margins and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional clock recovery systems are used, then clock signals can be transmitted concurrently with data signals, but timing errors occur due to integral non-linearity of delay elements
Solution Approach 1:
The delay line is segmented into multiple individually controllable delay elements rather than using a single monolithic delay element. This segmentation allows for finer granularity in timing adjustment and enables interpolation between delay values to achieve better timing accuracy while compensating for integral non-linearity effects.
Solution Approach 2:
The system dynamically changes the delay parameter by controlling the timing of clock edges relative to data edges. By adjusting the delay amount through controlled manipulation of clock signal timing, the system achieves precise alignment between clock and data signals, thereby improving timing accuracy and reducing errors.
2Measurement precision
If delay elements are used for clock alignment, then clock signals can be synchronized with data signals, but power consumption increases due to integral non-linearity requirements
Solution Approach 1:
The system applies partial delay adjustment rather than maximum delay, achieving sufficient clock alignment without over-compensating. By applying only the necessary delay amount needed for alignment and avoiding excessive delay application, the system reduces power consumption while maintaining adequate alignment precision.
Solution Approach 2:
The system optimizes the delay parameter to achieve the minimum necessary delay for proper clock alignment. By dynamically adjusting the delay parameter to match actual timing requirements rather than using fixed or excessive delay values, the system reduces power consumption while maintaining alignment precision.
3Productivity
If traditional delay line designs are used, then clock recovery can be implemented, but design flexibility is limited due to integral non-linearity constraints
Solution Approach 1:
The delay line is divided into multiple controllable segments that can be independently adjusted. This segmentation provides design flexibility by allowing different delay values to be applied to different segments, enabling the system to adapt to various timing requirements and compensate for non-linearities through differential adjustment of individual segments.
Solution Approach 2:
The delay line transitions from a static, fixed-delay design to a dynamic, programmable delay structure. By making the delay elements controllable and adjustable, the system gains adaptability to handle different data rates, timing conditions, and eye centering requirements, thereby improving design flexibility while maintaining clock recovery capability.
Data Source
AI summary
Embodiments herein relate to a clock interpolation system. The system may be configured to identify, at a change in logical state of a recovered clock signal, a logical state of a first signal when the first signal is delayed by a delay value. The system may be further configured to identify, at a change in logical state of a second signal, a logical state of the clock signal when the clock signal is delayed by the delay value. Based on the two identifications, the delay value and/or a timing of the clock signal may be adjusted. Other embodiments may be described and/or claimed.