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本报告叙述ZnO薄膜SAW TV接收机奈氏(Nyquist)滤波器及TV台解调器.滤波器由层状结构组成.溅射ZnO压电薄膜沉积在硼硅玻璃基片上,Al叉指电极插在ZnO膜和玻璃基片之间,而Al对向电极沉积在ZnO膜表面 ZnO膜的厚度大约是SAW波长的3%,变迹用改变对向电极形状来实现.找到了降低TV-VIF滤波器不可避免的插入损耗的先进的SAW设计,因此VIF级可以在没有任何前置放大器的情况下工作.精确的设计实现TV台的标准解调器;在通带内振幅平坦度0.05dB而群延迟波纹为10ns,这些滤波器显示出10ppm/℃和100ppm/25,000小时的漂移这样极好的频率稳定性.这种SAW滤波器目前正在生产.
This report describes ZnO thin film SAW TV receivers Nyquist filters and TV station demodulators. The filter consists of a layered structure. A sputtered ZnO piezoelectric film is deposited on a borosilicate glass substrate, with Al interdigital electrodes inserted Between the ZnO film and the glass substrate, the thickness of the ZnO film deposited on the surface of the ZnO film by the Al counter electrode is about 3% of the SAW wavelength, and the apodization is realized by changing the shape of the counter electrode. The unavoidable insertion loss of the advanced SAW design allows the VIF stage to operate without any preamplifier. The exact design achieves a standard demodulator for TV stations; an amplitude flatness of 0.05dB in the pass band The delay ripple is 10ns and these filters exhibit excellent frequency stability of 10ppm / ° C and 100ppm / 25,000 hours drift This SAW filter is currently in production.