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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Published on: December 15, 2021

SAW oscillator frequency stability at high temperatures.

B K Sinha¹, J L Groves, Y Sudo

¹Shlumberger-Doll Res., Ridgefield, CT.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1990

Summary

This summary is machine-generated.

Copper-doped aluminum electrodes significantly improve the frequency stability of surface-acoustic-wave (SAW) resonators, even at high temperatures and drive levels. This enhancement is crucial for reliable SAW device performance.

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Area of Science:

Materials Science
Electrical Engineering
Physics

Background:

Surface-acoustic-wave (SAW) resonators are critical components in various electronic devices.
Frequency stability is a key performance metric for SAW resonators.
Degradation in frequency stability can be caused by material interfaces and high drive levels.

Purpose of the Study:

To investigate factors affecting the frequency stability of SAW resonators.
To compare the performance of SAW devices with pure aluminum versus copper-doped aluminum electrodes.
To present experimental data on short-term and long-term frequency stability under various conditions.

Main Methods:

Fabrication of SAW devices with pure aluminum and copper-doped aluminum electrodes.
Experimental testing of frequency stability at different temperatures (25°C and 175°C).
Evaluation of stability under moderate to high drive levels.

Main Results:

Pure aluminum electrodes show rapid degradation in long-term frequency stability due to metal migration.
Copper-doped aluminum electrodes maintain excellent long-term stability, even at 175°C and high drive levels.
Short-term frequency stability for copper-doped devices reaches a few parts in 10^10, with optimal performance at a 0.1s gate time.

Conclusions:

Copper-doped aluminum electrodes offer superior frequency stability for SAW resonators compared to pure aluminum.
The presence of a chromium interface and high drive levels are detrimental to long-term stability in pure aluminum devices.
SAW devices with copper-doped aluminum electrodes are suitable for high-temperature and high-power applications.