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K-cut quartz SAW resonators for stable frequency sources
M Takagi1, E Momosaki, M Yamakita
1Div. of Res. and Dev., Seiko Epson Corp., Nagano.
Summary
A novel K-cut quartz resonator offers exceptional frequency stability. This new design minimizes thermal effects, providing a reliable frequency source for advanced applications.
Area of Science:
- Materials Science
- Electrical Engineering
- Physics
Background:
- Quartz Surface Acoustic Wave (SAW) resonators are crucial for stable frequency generation.
- Transient thermal behavior can significantly impact resonator frequency stability.
- Existing resonator designs face limitations in achieving ultra-high frequency stability.
Purpose of the Study:
- To develop a new quartz SAW resonator with enhanced frequency stability.
- To investigate and mitigate frequency instability caused by transient thermal effects.
- To introduce and characterize a novel K-cut angle for quartz SAW resonators.
Main Methods:
- Developed a new K-cut angle for quartz SAW resonators.
- Analyzed static and dynamic frequency temperature coefficients.
- Optimized resonator design considering electrode-film thickness, wave modes, and power-flow angles.
Main Results:
- Identified a new K-cut angle with zero static and dynamic frequency temperature coefficients at room temperature.
- Achieved a frequency stability of 2x10(-10) for a mean time of 0.01 s in optimized devices.
- Demonstrated the effectiveness of design considerations in improving resonator performance.
Conclusions:
- The K-cut quartz SAW resonator represents a significant advancement in stable frequency source technology.
- The developed resonators and oscillators exhibit superior frequency stability.
- This research provides a pathway for next-generation high-stability frequency sources.
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