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- W2189295188 abstract "Summary With wave velocities 1.1 to 1.7 times that of the Surface Acoustic Waves (SAW), the Shallow Bulk Acoustic Waves (SBAW) are particularly attractive for high frequency applications. In this paper an experimental 2 GHz SBAW delay line oscillator is described and its performance analyzed. The SBAW delay lines are fabricated on rotated Y-cut quartz substratzs with angle 0 near the AT-cut angle of 35.25 . For these substrates the SBAW has high velocity and a zero first order temperature coefficient of delay mar room temperature. Each delay line consists of two identical transducers with split finger configuration and operates at the third harmonic. Very thin aluminum metallization is used for the transducers. In addition, the fingers are embedded into the substrate surface in order to minimize diffraction loss at finger edges. The untuned insertion losses of these SRAW delay lines are consistently less than 25 dB. The 2 GHz SBAW delay line oscillator is constructed with discrete components which include the SBAW delay line, amplifier, external delay, and output coupler. Its short-term stability or phase noise is measured in the frequency domain and the result compared with theory. The medium stability of temperature effect is measured as a function of the metallization thickness and the crystal cut angle 0. Data on initial device burnin drift are also presented as an indication of the long-term aging characteristic of the SBAW oscillator." @default.
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- W2189295188 title "TRW Defense and Space Systems Group" @default.
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