Degradation of surface-acoustic-wave resonators
Abstract
Degradation of SAW resonators is analyzed, the irreversible upward frequency drift in the case of interdigital transducers with aluminum pin-electrode is explained by logarithmic oxidation faster than normally but the irreversible downward frequency drift in the case of interdigital transducers with gold pin-electrodes is evidently caused by oxidation together with diffusional smear. This latter mechanism is analyzed on the basis of a model which describes flicker fluctuations as a microprocess of thermodynamic aging. Calculations are made for the simplest oscillator consisting of two identical interdigital structures on a delay line each having N pin pairs.
- Publication:
-
USSR Rept Electron Elec Eng JPRS UEE
- Pub Date:
- April 1985
- Bibcode:
- 1985RpEEE.......12K
- Keywords:
-
- Drift (Instrumentation);
- Electrodes;
- Oxidation;
- Surface Acoustic Wave Devices;
- Models;
- Resonant Frequencies;
- Resonators;
- Static Stability;
- Wavelengths;
- Communications and Radar