Low-phase-noise surface-acoustic-wave oscillator using an edge mode of a phononic band gap

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°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 $6.5\times 10^{-10}$ 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.

References in corpus (7)

• Integrated photonics on thin-film lithium niobate
• Electrically-pumped high-power laser transmitter integrated on thin-film lithium niobate
• An Optical Atomic Clock Based on a Highly Charged Ion
• Phononic band structure engineering for high-Q gigahertz surface acoustic wave resonators on lithium niobate
• Gigahertz phononic integrated circuits on thin-film lithium niobate on sapphire
• A chip-scale atomic beam clock
• Thermal Modulation of Gigahertz Surface Acoustic Waves on Lithium Niobate

Cited by in corpus (4)

• Room-temperature mid-infrared detection using metasurface-absorber-integrated phononic crystal oscillator
• On-chip cavity electro-acoustics using lithium niobate phononic crystal resonators
• Energy-efficient spin Hall nano-oscillators using near-compensated CoGd ferrimagnets
• Injection locking of GHz-frequency surface acoustic wave phononic crystal oscillator