THEORETICAL ANALYSIS OF REAL-TIME AIR-GAP COUPLED SAW CONVOLVERS

• 作 者: 冯所椿
• 出 处: Chinese Journal of Acoustics
• 发表日期: 1986年04期
• 关键词: depleted inverted figure dealing convolution accumulated essentially explain neg

In this paper,a new theory is developed for the analysis of real-time air-gap coupled SAWconvolvers.There are two important features about the theory proposed here.Firstly,we rigorouslyconsider the role of the surface states of semiconductors in acoustoelectric nonlinear interactions.Secondly,by means of a new equivalent circuit for such a convolver,we derive various new analyticalexpressions which describe the linear coupling coefficient for air-gap,nonlinear coupling coefficientfor acoustoelectric nonlinear interactions,and convolution output(or figure of merit);these expres-sions exhibit obvious dependence on bias.The frequency response of the surface states is also ana-lyzed. The theory presented here is a general formula applicable to dealing with the situation when thesemiconductor surface is accumulated,at flat-band,depleted,or inverted. The presented theory can essentially explain experimental results of SAW acoustoelectric non-linear interactions which were carried out by the author and others.

In this paper, a new theory is developed for the analysis of real-time air-gap coupled SAWconvolvers. There are two important features about the theory proposed here. Firstly, we rigorouslyconsider the role of the surface states of semiconductors in acoustoelectric nonlinear interactions.次, by means of a new equivalent circuit for such a convolver, we derive various new analyticalexpressions which describe the linear coupling coefficient for air-gap, nonlinear coupling coefficientfor acoustoelectric nonlinear interactions, and convolution output (or figure of merit); these expres- sions exhibit obvious dependence on bias. The frequency response of the surface states is also ana-lyzed. The theory presented here is a general formula applicable to dealing with the situation when these semiconductor surfaces are accumulated, at flat-band, depleted, or inverted. The presented theory can fundament explain experimental results of SAW acoustoelectric non-linear interactions which were carried out by the author and others.