1. Low-phase-noise surface acoustic wave oscillator using phononic crystal bandgap-edge mode
- Author
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Xi, Zichen, Thomas, Joseph G., Ji, Jun, Wang, Dongyao, Cen, Zengyu, Kravchenko, Ivan I., Srijanto, Bernadeta R., Yao, Yu, Zhu, Yizheng, and Shao, Linbo
- Subjects
Physics - Applied Physics - Abstract
Low-phase-noise microwave-frequency integrated oscillators provide compact solutions for various applications in signal processing, communications, and sensing. Surface acoustic waves (SAW), featuring orders-of-magnitude shorter wavelength than electromagnetic waves at the same frequency, enable integrated microwave-frequency systems with much smaller footprint on chip. SAW devices also allow higher quality (Q) factors than electronic components at room temperature. Here, we demonstrate a low-phase-noise gigahertz-frequency SAW oscillator on 128{\deg}Y-cut lithium niobate, where the SAW resonator occupies a footprint of 0.05 mm$^2$. Leveraging phononic crystal bandgap-edge modes to balance between Q factors and insertion losses, our 1-GHz SAW oscillator features a low phase noise of -132.5 dBc/Hz at a 10 kHz offset frequency and an overlapping Hadamard deviation of $6.5\times10^{-10}$ at an analysis time of 64 ms. The SAW resonator-based oscillator holds high potential in developing low-noise sensors and acousto-optic integrated circuits.
- Published
- 2024