Abstract
A unified approach to the nodal analysis of multitransducer surface acoustic wave (SAW) devices is presented. Assuming a grounded SAW transducer to be reflectionless, analytic formulae for the nodal admittance matrix (NAM), interrelating currents and voltages on the electric ports are deduced. Diagonal NAM elements represent self-admittances of SAW transducers and can be calculated by applying known techniques of SAW transducer admittance calculation. Off-diagonal elements, accounting for acoustic interaction of the elemental SAW transducers, are deduced from the short-circuit currents induced in each grounded SAW transducer when only one SAW transducer of the system is activated, with all the others being grounded. The closed-form NAM allows to extend standard nodal analysis techniques for the electric networks to the acousto-electric circuits comprising both SAW devices as well as conventional electric components.
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