Adaptive Digital Phase Detector for Fast Lock and Low Complexity
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Solution Overview
Problem
Conventional digital phase and frequency detectors face challenges in achieving accuracy and low complexity while optimizing hardware resources, locking time, and power consumption, and struggle to adaptively switch between operating modes based on phase error polarity changes.
Innovation Solution
A digital phase and frequency detector with at least two operating modes, allowing adaptive switching between linear and saturation modes to optimize hardware resources, locking time, and power consumption, and increase phase detection resolution by determining timing differences and polarity between reference and feedback clocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digital phase and frequency detector uses a time-to-digital converter to achieve accurate phase detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a dual-mode operating system that dynamically switches between linear mode and saturation mode based on the phase error magnitude. In linear mode, the detector provides high-resolution phase error information for accurate locking. In saturation mode, it provides only polarity information to reduce hardware complexity and power consumption when the phase error is large. This dynamic adaptation resolves the contradiction by adjusting the measurement precision and device complexity according to the operational requirements.
2Measurement precision
If a digital phase and frequency detector operates in linear mode with full phase error information, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent employs a dynamic operating mode that switches between linear mode (high precision, high power) and saturation mode (low precision, low power) based on the phase error magnitude. When the phase error is small and precise locking is needed, the system operates in linear mode with full phase error information. When the phase error is large and only polarity information is needed for coarse adjustment, the system switches to saturation mode, significantly reducing power consumption while maintaining sufficient functionality.
3Device complexity
If a digital phase and frequency detector reduces hardware resources to lower complexity, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent implements a dynamic operating mode that adjusts the detector's functionality based on operational needs. In saturation mode, the detector uses minimal hardware resources to determine only the polarity of the phase error, significantly reducing hardware complexity. In linear mode, the full hardware resources are utilized to provide high-resolution phase error information. This dynamic adaptation allows the system to optimize the trade-off between hardware resources and measurement precision according to the current operational requirements.
4Use of energy by moving object
If a digital phase and frequency detector uses saturation mode to reduce power consumption, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent employs a dynamic operating mode that switches between saturation mode (low power, low precision) and linear mode (high power, high precision) based on the phase error magnitude. In saturation mode, the detector operates with minimal power consumption by determining only the polarity of the phase error, sacrificing magnitude information. In linear mode, the detector restores full measurement precision by providing complete phase error information, but at the cost of increased power consumption. This dynamic adaptation resolves the contradiction by adjusting power consumption and measurement precision according to the operational requirements.
Data Source
AI summary
A method for digital phase detection, comprises the steps of: providing a reference clock; receiving a feedback clock; determining a timing difference between the reference clock and the feedback clock; determining a polarity that indicates the leading or lagging relationship between the reference clock and the feedback clock; adaptively selecting one of at least two operating modes for generating a quantized level indicative of the timing difference, wherein in a first operating mode the quantized level is a constant maximum value and wherein in a second operating mode the quantized level is proportional to the timing difference; and generating a digital phase detection output as a combination of the polarity and the quantized level.