PLL Phase Noise Filter Switching Across Offset Frequencies
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Solution Overview
Problem
In PLL circuits, users without expertise face challenges in determining the optimal low-pass filter settings for minimizing phase noise across different offset frequencies, requiring time-consuming manual measurements and data analysis.
Innovation Solution
A phase noise optimization device and method that automatically measure and optimize phase noise by using a PLL circuit with a filter selection unit, A/D converter, and phase noise calculation unit to compare data from multiple low-pass filters, generating optimized phase noise data without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple low-pass filters are switched to optimize phase noise for different offset frequencies, then phase noise performance is improved, but user operation complexity and measurement time increase
Solution Approach 1:
The system automatically performs filter switching and phase noise measurement without requiring user intervention. The control unit autonomously switches between multiple low-pass filters, measures phase noise for each configuration, and determines the optimal filter setting, thereby eliminating the need for users to manually switch filters and analyze measurement data.
Solution Approach 2:
The system implements automatic feedback control by measuring phase noise for each filter configuration and using this measurement data to determine the optimal low-pass filter setting. The control unit receives phase noise measurements, compares results across different offset frequencies, and automatically selects the filter configuration that minimizes phase noise, creating a closed-loop optimization process.
2Measurement precision
If multiple low-pass filters are switched to optimize phase noise for different offset frequencies, then phase noise performance is improved, but measurement time and data processing effort increase
Solution Approach 1:
The system performs preliminary automatic filter switching and measurement setup before the actual phase noise optimization measurement begins. The control unit pre-configures the measurement sequence, automatically switches between filters in the predetermined sequence, and prepares the data processing framework in advance, thereby reducing the total measurement time and eliminating post-measurement data processing effort.
3Loss of information
If manual data extraction from multiple measurements is performed, then comprehensive phase noise data is obtained, but work time and labor increase
Solution Approach 1:
The system replaces manual data extraction and processing operations with automated electronic control and digital signal processing. The control unit automatically extracts phase noise data from multiple measurements, processes the data through computational algorithms, and generates the final optimization results, thereby eliminating the need for users to manually extract and analyze data from multiple measurements.
Data Source
AI summary
To provide a phase noise optimization device and a phase noise optimization method which are capable of automatically measuring optimum phase noise according to an offset frequency. There is included a phase noise data generation unit 28 that generates at least two types of phase noise data corresponding to at least two low-pass filters (LPFs) 15a and 15b selected by a filter selection unit 16 in at least one measurement frequency range, set in advance, out of a plurality of measurement frequency ranges, a comparison unit 29 that compares at least two types of phase noise data, and a phase noise optimization unit 30 that generates optimized phase noise data based on a comparison result of the comparison unit 29.