Title :
Frequency stability of SAW oscillators at high temperatures
Author :
Sinha, Bikash K. ; Groves, Joel L. ; Sudo, Yukio ; Sato, Shigeru
Author_Institution :
Nippon Schlumberger KK, Kanagawa, Japan
Abstract :
A broad overview is given of various factors affecting the frequency stability of surface-acoustic-wave (SAW) resonators. The objective has been to unravel the causes of large frequency drifts observed in SAW resonators operating at temperatures of 135°C and beyond. Experimental data are presented on both the long-term and short-term frequency stabilities of SAW devices at 25°C and 175°C for moderate to high drive levels. The behavior of SAW devices with pure aluminum and copper-doped aluminum electrodes are compared. It is shown that the short-term frequency stability of SAW devices with copper-doped aluminum electrodes is a few parts in 1010 even at 175°C and for moderately large drive levels. Overall, the best short-term frequency stability is found to be for a gate time of 0.1 s
Keywords :
frequency stability; oscillators; surface acoustic wave devices; 0.1 s; 135 degC; 175 degC; 25 degC; Al; Al:Cu; SAW oscillators; frequency drifts; long term frequency stability; short-term frequency stabilities; Aluminum; Chromium; Electrodes; Fingers; Frequency; Oscillators; Stability; Surface acoustic wave devices; Surface acoustic waves; Temperature;
Conference_Titel :
Frequency Control Symposium, 1988., Proceedings of the 42nd Annual
Conference_Location :
Baltimore, MD
DOI :
10.1109/FREQ.1988.27617
