Oscillator Wiring Segmentation for Noise Immunity
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Solution Overview
Problem
Existing oscillators, such as quartz crystal oscillators, face issues with oscillation accuracy deterioration due to interference from digital control signals during dynamic digital control of oscillation frequency, leading to phase noise and frequency shifts.
Innovation Solution
The oscillator design separates the wiring patterns for clock signals and digital control signals, placing them on different sides of the package and ensuring they do not cross, with additional wiring patterns connected to power supply terminals, to minimize capacitive coupling and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If the wiring pattern for connecting the quartz crystal resonator and monitor terminals is elongated to enable external measurement, then the measurement capability is improved, but the noise immunity deteriorates due to increased susceptibility to external noise
Solution Approach 1:
The patent segments the wiring patterns into functionally distinct groups: monitor terminal wiring separated from digital control wiring, and resonator wiring separated from both. This spatial segmentation reduces electromagnetic coupling and noise interference while maintaining measurement capability through dedicated monitor terminals.
2Adaptability or versatility
If digital control signals are used to dynamically control oscillation frequency, then the adaptability is improved, but the oscillation accuracy deteriorates due to interference from digital signals
Solution Approach 1:
The patent extracts digital control signals and their wiring patterns from the analog oscillation circuit area, placing them on separate sides of the package. This extraction eliminates digital signal interference with the analog oscillation while preserving dynamic frequency control capability through dedicated control terminals.
Solution Approach 2:
The patent applies different wiring layout strategies to different functional areas: analog oscillation circuits receive shielding and grounding optimized for low noise, while digital control terminals are positioned and routed to minimize coupling with analog sections. Each area receives localized wiring quality optimized for its specific function.
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 reduces capacitive coupling between the wiring patterns, thereby enhancing oscillation accuracy and immunity to noise interference, ensuring stable and accurate clock signal generation.
Implementation Method 1
a resonator (20) and an oscillation circuit (30) disposed in the package (10)
Implementation Method 2
a first wiring pattern and a second wiring pattern disposed in the package (10), and electrically connecting a pair of terminals of the resonator (20) and the oscillation circuit (30) to each other
Implementation Method 3
effectively reduces capacitive coupling between the wiring patterns, thereby enhancing oscillation accuracy and immunity to noise interference
Data Source
AI summary
An oscillator includes a package having a first side, a second side, a third side, and a fourth side, a resonator and an oscillation circuit disposed in the package, an output terminal arranged along the first side of the package, and outputting a clock signal generated by the oscillation circuit, and a control terminal arranged along the second side of the package, and supplied with a digital control signal adapted to update an operation state of the oscillation circuit.