MHz VCO Resonators with ZnO/ELINVAR Structures

New piezoelectric resonators made of ZnO/ELINVAR structures have been developed for 3.58 MHz TV oscillators by utilizing expanding vibrations. In addition to superior features such as a miniature structure, low production cost and achievement of high productivity, the resonators possess a frequency pulling range several times as wide as a conventional 3.58 MHz TV resonator. Trimmer-less, adjustment-free TV chroma circuits have been realized by the incorporation of the new resonators.