Abstract

A theory of lossless parametric operation in surface-acoustic-wave convolver is developed by applying the treatment of parametric operation in varactor diodes. It is shown that much improvement in convolver efficiency can be achieved by the separation of the output circuit from the input circuit by filters, by the elimination of useless constant capacitance components by tuning with inductance in input and output circuits, and by the impedance matching in input and output circuits. Preliminary experiments on such a convolver in a ZnO/SiO2/Si system confirm our theory and show the highest internal efficiency among convolvers examined so far.

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