Quadrature Clock Generation With Injection-Locked Phase Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Phase mismatch between in-phase (I) and quadrature (Q) clock signals in quadrature clock generators leads to signal degradation and data errors, particularly in high-frequency communications like multi-gigabit SERDES systems, where existing solutions fail to adequately minimize these mismatches.
Innovation Solution
A quadrature clock generator utilizing two injection-locked oscillators and a single phase interpolator to generate phase-shifted I and Q clock signals, reducing phase mismatch by eliminating the need for multiple phase interpolators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple phase interpolators are used to generate I and Q clock signals, then phase coverage and flexibility are improved, but phase mismatch and signal degradation worsen
Solution Approach 1:
The patent merges multiple phase interpolators into a single phase interpolator that generates both I and Q clock signals. This consolidation eliminates the phase mismatch problems that arise from using multiple separate interpolators, while still providing the necessary phase coverage through the unified interpolator's ability to generate multiple phase-shifted outputs.
Solution Approach 2:
The single phase interpolator is designed to perform multiple functions: it generates both I and Q clock signals with appropriate phase relationships. This multi-functional approach replaces the need for separate interpolators for each signal, reducing phase mismatch while maintaining adaptability.
2Productivity
If clock frequency is increased to improve data transmission rate, then productivity is improved, but phase mismatch between I and Q signals worsens
Solution Approach 1:
By combining the generation of I and Q clock signals through a single phase interpolator, the system maintains precise phase relationships even at higher clock frequencies. This unified approach ensures that phase matching accuracy is preserved as transmission rates increase.
3Device complexity
If a single phase interpolator is used to generate both I and Q clock signals, then device complexity is reduced, but phase mismatch may increase
Solution Approach 1:
The patent successfully merges multiple interpolators into one, reducing device complexity. The single interpolator is designed to generate both I and Q signals with proper phase relationships, thereby maintaining phase matching accuracy despite the reduction in component count.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively minimizes phase mismatch and enhances signal integrity in wireless and wired communications by generating accurate and synchronized I and Q clock signals, improving data transmission and reception accuracy.
Implementation Method 1
a first injection-locked oscillator, a second injection-locked oscillator configured
Data Source
AI summary
A quadrature clock generator is disclosed. The quadrature clock generator may include a first injection-locked oscillator, a phase interpolator, and a second injection-locked oscillator. The first injection-locked oscillator may generate a first plurality clock signals from a first reference clock signal. The phase interpolator may generate a second reference clock signal from the first plurality of clock signals, and the second injection-locked oscillator may generate a second plurality of clock signals from the second reference clock signal. A first quadrature clock signal may be selected from the first plurality of clock signals and a second quadrature clock signal may be selected from the second plurality of reference clock signals.