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为了得到用于CATV信号加解扰的非线性相位、非对称幅频特性的声表面波(SAW)滤波器,本文采用面向对象的程序设计语言C++,编制了可以设计和综合任意幅频特性、任意相频特性的本表面波滤波器的计算机设计软件.本文在一个设计中同时采用了多种本征函数综合所要求的幅频和相频特性.结果用非常少的叉指对数的加权换能器实现了在38MHz图象载频上倒相,并使38MHz到39.25MHz的平台,相对31.25MHz到33.57MHz的平台衰减某个电平XdB.与之对应的一个器件则将图象载频再倒相,并使被衰减的平台升高电平XdB.在网络分析仪上实测结果与理论设计的结果一致.
In order to obtain SAW filter with non-linear phase and asymmetric amplitude-frequency characteristic for CATV signal descrambling, an object-oriented programming language called C ++ was used in this paper to develop a method to design and synthesize any amplitude- Arbitrary phase characteristics of the surface wave filter computer design software.This paper in a design using a combination of a variety of eigenfunctions required amplitude and phase frequency characteristics.Results with very little interdigitated logarithmic weighting The transducer achieved phase reversal at a 38 MHz image carrier and attenuated the platform from 38 MHz to 39.25 MHz by a factor of X dB relative to a platform from 31.25 MHz to 33.57 MHz. A corresponding device, on the other hand, Frequency and phase inversion, and the platform was raised by the level of XdB. The measured results on the network analyzer consistent with the theoretical design.