Grating-mode-type wide-band SAW resonators for VCOs

Author

Isobe, A. ; Hikita, M. ; Asai, K. ; Sumioka, A.

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

1

fYear

1998

fDate

1998

Firstpage

111

Abstract

Grating-mode-type surface acoustic waves (SAWs) that are particularly suitable for wide-band SAW resonators were found. Their bandwidths are larger than 13%. Their spurious responses originating from Rayleigh waves are almost negligible when the Al-grating thickness is optimized for the cut angle of substrate. For example, the ratio of the Al-grating thickness to the SAW wavelength must be required within 0.125±0.007 for 15°-rotated Y-cut X-propagating lithium niobate. These SAW resonators were applied to UHF-band voltage-controlled oscillators. They achieved a high control-voltage sensitivity of 13.5 MHz/V (3.2%/V) and a high phase-noise performance of <-115 dBc/Hz offset 25 kHz from the carrier

Keywords

UHF oscillators; VHF oscillators; aluminium; equivalent circuits; lithium compounds; surface acoustic wave oscillators; surface acoustic wave resonators; voltage-controlled oscillators; 400 to 500 MHz; Al; Al-grating thickness optimization; LiNbO₃; UHF-band VCO; VHF-band VCO; grating-mode-type; phase-noise performance; substrate cut angle; voltage-controlled oscillators; wideband SAW resonators; Acoustic waves; Analytical models; Bandwidth; Electrodes; Gratings; Impedance; Resonant frequency; Surface acoustic waves; Voltage-controlled oscillators; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE

Conference_Location

Sendai

ISSN

1051-0117

Print_ISBN

0-7803-4095-7

Type

conf

DOI

10.1109/ULTSYM.1998.762110

Filename

762110