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Related Experiment Videos

Temperature-stable double SAW resonators.

Guenter Martin1, Reinhard Kunze, Bert Wall

  • 1Leibniz Institute for Solid State and Materials Research Dresden, Germany. g.martin@ifw-dresden.de

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 13, 2008
PubMed
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Double resonators significantly enhance temperature stability in surface acoustic wave (SAW) devices by using single resonators with opposing temperature coefficients. This method achieves a vanishing 1st-order temperature coefficient of frequency (TCF1) for improved performance.

Area of Science:

  • Materials Science
  • Electrical Engineering
  • Acoustics

Background:

  • Surface Acoustic Wave (SAW) resonators on quartz exhibit temperature-dependent frequency shifts.
  • First-order temperature coefficients of frequency (TCF1) impact device performance across temperature variations.
  • Compensating second-order temperature coefficients of frequency (TCF2) is crucial for high-stability applications.

Purpose of the Study:

  • To enhance the temperature stability of SAW resonators.
  • To investigate methods for compensating both TCF1 and TCF2 in SAW double resonators.
  • To present novel designs for temperature-stable SAW double resonators.

Main Methods:

  • Utilizing double resonators with single resonator components having turnover temperatures above and below room temperature.

Related Experiment Videos

  • Adjusting turnover temperatures via different propagation directions on ST-cut quartz.
  • Developing and analyzing concepts for compensating TCF2 in one-port and two-port SAW double resonators.

    • Main Results:

    • Achieved vanishing TCF1 in double resonators by positioning single resonator turnover temperatures strategically.
    • Detailed two specific designs: a cascaded two-port resonator and a parallel one-port resonator configuration.
    • Demonstrated frequency shifts below 20 ppm over a -30°C to 70°C temperature range for both designs using 35.5° rotY quartz.

    Conclusions:

    • Double resonator configurations effectively improve the temperature stability of SAW devices.
    • The proposed methods successfully compensate for both first and second-order temperature effects.
    • The developed temperature-stable SAW double resonators offer high performance within a wide temperature range.