Diode coupled tapped acoustic delay line correlator and convolve

Details Diode coupled tapped acoustic delay line correlator and convolve Diode coupled tapped acoustic delay line correlator and convolve

1973-10-09

1977-04-05

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

235181, 310 98, 333 72, H03H 926, H03H 930, G06G 719, H01L 904

Patent

active

040165140

ABSTRACT:
A nonlinear delay line correlator and convolver is described which comprises a tapped, piezoelectric surface acoustic wave delay line and an array of series or parallel connected forward biased semiconductor diodes. An interdigital signal transducer is connected to each end of the delay line and voltages are applied to each transducer to generate contra-flowing acoustic strain waves which are radiated toward an interaction region comprising a plurality of equi-spaced weakly coupled interdigital transducers, each transducer being connected to one diode. Nonlinear signal mixing in the diode array is utilized to perform serial product convolution or correlation of the signal modulation applied at the two signal input transducers. Because of the large nonlinearity of semiconductor diodes, insertion loss is relatively low. One feature of the diode correlator is a novel dual acoustic beam transducer which permits two separate acoustic beams to be generated without interaction therebetween except at the transducer taps.

REFERENCES:
patent: 3691406 (1972-09-01), Mize
Luukkala et al. - "Convolution and Time Inversion Using Parametric Interactions of Acoustic Surface Waves," in Applied Physics Letters, vol. 18, No. 9, May 1, 1971, pp. 393-394.

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