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最近,在信号处理领域中应用SAW功能器件的研究工作十分兴旺,其中一部分业已付诸实用.利用SAW的功能器件具有如下优点:(1)因为在传播途中信号可以自由存取,所以可获得具有处理十分复杂的信号能力的功能器件;(2)由于能量集中于表面,所以可获得利用其他波动如光与半导体中载流子的较强互作用的功能器件;(3)能量密度高,因而可以得到利用非线性效应的功能器件等等.另外,作为可与SAW功能器件相竞争的器件有采用IC的数字技术和采用CCD器件的计算机模拟技术,而SAW功能器件具有:信号处理速度快;可进行实
Recently, research into the application of SAW functional devices in the signal processing field has been very successful and some of them have been put into practical use.The functional devices using SAW have the following advantages: (1) Since signals are freely accessible during propagation, (2) since the energy is concentrated on the surface, it is possible to obtain a functional device utilizing other fluctuations such as strong interaction of light with carriers in the semiconductor; (3) high energy density and thus Functional devices utilizing non-linear effects, etc. In addition, as devices that can compete with SAW functional devices, there are digital technologies using ICs and computer simulation technologies using CCD devices, whereas SAW functional devices have the advantages of fast signal processing, Can be real