Title :
Love-type-SAW resonator of small size with very low capacitance ratio and its application to VCO
Author :
Shimizu, Hiroshi ; Suzuki, Y. ; Kanda, T.
Author_Institution :
Univ. of Electro-Commun., Tokyo, Japan
Abstract :
A Love-type SAW (surface acoustic wave) resonator comprising an Au-electrode IDT (interdigital transducer) on a rotated Y-cut LiNbO3 substrate has been developed. This resonator can be made very small in size and extremely broad in bandwidth. Spurious responses of the resonator resulting from longitudinal and transverse modes and the Rayleigh SAW were suppressed simultaneously without resonance Q degradation by the modified rhombus weighting of the IDT, and by the correct choice of the electrode thickness and rotation cut angle of the substrate. Applying the resonator to a voltage controlled oscillator (VCO) circuit, a VCO with an exceedingly broad bandwidth and low power consumption was developed
Keywords :
Q-factor; crystal resonators; radiofrequency oscillators; surface acoustic wave devices; variable-frequency oscillators; 400 MHz; Au electrode interditigal transducer; LiNbO3 substrate; Love-type-SAW resonator; VCO; broad bandwidth; electrode thickness; low capacitance ratio; low power consumption; modified rhombus weighting; resonance Q; rotated Y-cut substrate; rotation cut angle; spurious response suppression; voltage controlled oscillator; Acoustic transducers; Acoustic waves; Bandwidth; Capacitance; Circuits; Degradation; Electrodes; Resonance; Surface acoustic waves; Voltage-controlled oscillators;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171334
