Multi-Clock Divider Synchronization via Lower-Frequency Cycle Slipping
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Solution Overview
Problem
Existing frequency division systems face challenges in providing clock signals with precise frequency resolution, low jitter, and efficient power consumption, particularly in high-speed data communication systems.
Innovation Solution
The implementation of fractional frequency dividers that provide programmable synchronous frequency division, utilizing all-digital circuits to achieve fine frequency resolution, low jitter, and scalable designs that are portable to newer integrated circuit processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional frequency division systems are used, then device complexity is reduced, but frequency resolution precision deteriorates
Solution Approach 1:
The frequency division is segmented into multiple stages: a first frequency divider divides the reference clock by an integer factor, and a second frequency divider (slip divider) performs fractional division by selectively skipping cycles. This segmentation enables fine frequency resolution without requiring a single complex fractional divider, thus resolving the contradiction between precision and complexity.
Solution Approach 2:
The slip divider dynamically adjusts the division ratio by selectively skipping clock cycles based on control signals. This dynamic cycle skipping mechanism allows the system to achieve variable fractional frequency division with high precision while maintaining relatively simple circuit architecture, addressing the contradiction between frequency resolution and device complexity.
2Speed
If high-speed clocks are used, then data transfer speed is improved, but power consumption increases
Solution Approach 1:
The slip divider performs partial frequency division by selectively skipping certain clock cycles rather than dividing every cycle. This partial action approach enables the system to generate lower frequency output signals from high-speed clocks, thereby reducing power consumption while maintaining the capability for high-speed data transfer when needed, thus resolving the contradiction between speed and power consumption.
3Adaptability or versatility
If multiple clock domains with different frequencies are used, then functionality and operation modes are improved, but synchronization difficulty increases
Solution Approach 1:
The system uses a phase detector as an intermediary to monitor phase differences between clock domains and generates control signals for the slip divider. This intermediary mechanism enables automatic synchronization between multiple clock domains with different frequencies, allowing the system to maintain high functionality and adaptability while reducing synchronization complexity through automated control.
Data Source
AI summary
Systems and methods for synchronizing multiple of output clocks. The system includes: a plurality of frequency dividers configured to receive a plurality of input clock signals and produce a plurality of output clock signals, wherein each of the plurality of output clock signals are lower in frequency than a corresponding input clock signal; and a circuit. The circuit is configured to: compare a first output clock signal of the plurality of output clock signals to a second output clock signal of the plurality of output clock signals to determine whether the first output clock signal is synchronized with the second output clock signal, generate a slip signal in response to determining that the first output clock signal is not synchronized with the second output clock signal, and apply the slip signal to the second output clock signal to synchronize the second output clock signal with the first output clock signal.