Interdigital transducer weighting method and device, interdigital transducer and saw filter
A technology of interdigital transducers and SAW filters, which is applied to electrical components, impedance networks, etc., can solve the problems of poor filter stopband suppression and limited application range, and optimize device performance, reduce repeated processes, shorten The effect of development cycle and cost
Active Publication Date: 2019-10-22
北京航天微电科技有限公司
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Problems solved by technology
If the synlinear structure adopts two non-apodized weighted transducers with equal finger length, the stop band suppression of the filter is relatively poor, which is suitable for filter design with relatively small bandwidth, and its application range is limited
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[0020] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.
[0021] figure 2 This is a schematic flowchart of a method for weighting an interdigital transducer provided by an embodiment of the present invention. like figure 2 As shown, the method includes:
[0022] S1, perform apodization weighting on the interdigital transducer to obtain an apodization weighted transducer;
[0023] S2, according to the preset activation condition, the preset weighting rule and the preset stop condition, perform adaptive finger extraction weighting on the apodization weighted transducer to obtain at least one set of adaptive finger extraction structures.
[0024] In the above-mentioned embodiment, firstly, the apodization weighting is performed on the interdigital transducer to obtain the apodization weighte...
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The invention discloses an interdigital transducer weighting method, which comprises the following steps: performing apodization weighting on an interdigital transducer to obtain an apodization weighted transducer; and when the finger strip length of the apodization weighted transducer meets a preset activation condition, performing adaptive finger extraction weighting on the apodization weightedtransducer according to a preset weighting rule and a preset stop condition to obtain at least one group of adaptive finger extraction structures. According to the method, the apodization weighted transducer is not provided with a fixed finger extraction starting position, a finger strip number and a weighting amplitude, the adaptive algorithm is adopted to realize the extraction weighting designof an unfixed position and an unfixed amplitude, the apodization weighting effect is achieved, the design efficiency of the filter can be effectively improved, the repeated process is reduced, the development period and cost are shortened, the device performance is optimized, and the method has important guiding significance for the design and optimization of similar filters.
Description
technical field [0001] The present invention relates to the technical field of sound surface filters, and in particular, to an interdigital transducer weighting method and device, an interdigital transducer and a sound surface filter. Background technique [0002] SAW transversal filters are generally composed of two or more interdigital transducers (IDTs). The two interdigital transducers must have a non-apodized transducer of equal finger length in order to use the same line type. Structural design, thereby reducing the volume of the filter. The structure of the SAW filter with the same linear structure is as follows figure 1 shown, where IDT1 is an apodized transducer and IDT2 is a non-apodized transducer. The stopband suppression of the non-apodized transducer is small. In order to improve the stopband suppression of the filter, another interdigital transducer uses an apodized transducer, and the envelope of the interdigital transducer needs to be apodized weighted . ...
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IPC IPC(8): H03H9/02H03H9/145H03H9/64
CPCH03H9/02803H03H9/14517H03H9/6406Y02D30/70
Inventor 王永安宋燕陈浩陈长娥苗峰维曹玉范佰杰
Owner 北京航天微电科技有限公司