Phase Detection Module Using Multi-Cycle Jitter Filtering
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Solution Overview
Problem
Conventional phase locked loops (PLLs) face difficulties in accurately determining the phase relationship between signals due to noise or jitter, leading to misjudgment in signal processing.
Innovation Solution
A phase detecting module comprising a phase detecting unit, a comparator, and a counter that compares input signals, generates a phase detecting result, and resets the counting value when it reaches a predetermined value, allowing for accurate detection by eliminating noise influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional phase detector is used to compare two signals, then the phase relationship can be determined, but noise or jitter causes misjudgment when the phase difference is very small
Solution Approach 1:
The patent applies preliminary action by accumulating phase detecting results over multiple signal periods before making a final determination. The counter accumulates the number of times the phase detecting unit outputs a first level signal, and only after the counter reaches a predetermined value (completing multiple periods) does the system output the final comparing result. This preliminary accumulation process filters out noise and jitter that would otherwise cause misjudgment in single-period comparisons.
Solution Approach 2:
The patent implements continuity of useful action by continuously comparing signals over multiple consecutive periods rather than making a single discrete comparison. The phase detecting unit continuously monitors the phase relationship, and the counter continuously accumulates results across multiple periods, ensuring that the measurement process is ongoing and cumulative rather than intermittent or single-shot.
2Productivity
If signal comparison is performed continuously, then phase relationship can be tracked, but noise and jitter cause erroneous phase detection
Solution Approach 1:
The patent maintains continuous phase detection through the phase detecting unit that operates throughout multiple signal periods, ensuring no loss of detection capability. The continuous operation is preserved while accuracy is improved by accumulating results over time rather than making isolated measurements.
Solution Approach 2:
The system implements feedback by using the accumulated counting value from multiple periods to determine the final comparing result. The phase detecting unit's output feeds into the counter, which accumulates the results, and this accumulated information then determines the final output. This feedback loop over multiple periods allows the system to use historical data to improve current measurement accuracy.
Data Source
AI summary
A phase detecting module includes a phase detecting unit, a comparator and a counter. The phase detecting unit is arranged to compare a first input signal and a second input signal to generate a phase detecting result. The comparator is arranged to compare the phase detecting result and a predetermined voltage to generate a comparing result. The counter is arranged to count one of the first input signal and the second input signal to generate a counting value. The phase detecting result and the counting value are reset if the counting value reaches a predetermined value, and the comparing result is outputted to a target device from the comparator if the counting value reaches a predetermined value.