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用于频率合成的声表面波滤波器必须通过梳状频谱的一个单音,与此同时,最大限度地抑制不用的摸式。我们用汉敏加权的变迹换能器与非变迹换能器结合获得所需的零抑制。非变迹换能器的长度由要滤波的梳状频谱的频域周期确定,变迹换能器的长度则以实现最佳的零结构为准。本文介绍包括S T石英基片上梳状频谱周期为3兆赫、工作频率为336兆赫的薄双电极器件及要进行衍射量和相位较正的一些滤波器的设计方法、制作工艺和实验结果,还讨论了在工作频率为936兆赫时对 24兆赫梳状频谱周期进行滤波并使不用的单音抑制在65分贝以下的单电极滤波器的设计。这种结构的滤波器可用作本文介绍的新型混频合成器,用两个滤波器组和两个混频级可以克服声表面波器件的线宽/频率限制并减少一定数量单音所需的滤波器数。
The surface acoustic wave filter used for frequency synthesis must pass a single tone of the comb spectrum, while minimizing unwanted modes. We used the Hammer weighted apodization transducer with a non-apodized transducer to achieve the desired zero rejection. The length of a non-transformable transducer is determined by the frequency domain period of the combed spectrum to be filtered, and the length of the apodization transducer is based on the best zero structure. This article describes the design methodology, fabrication techniques, and experimental results of several thin-film bipolar devices that include a 3-MHz comb spectrum on the ST quartz substrate with a 336 MHz operating frequency and diffraction and phase corrections The design of a single-pole filter that filters 24 MHz comb spectrum cycles at 936 MHz and keeps unused tones below 65 dB. This structure of the filter can be used as a new mixer synthesizer introduced in this article, with two filter banks and two mixer stages to overcome the linewidth / frequency limitations of SAW devices and reduce the number of tones required The number of filters.