Surface acoustic wave convolver

Details Surface acoustic wave convolver Surface acoustic wave convolver

1992-01-28

1993-11-16

Barron, Jr., Gilberto

Boots, shoes, and leggings

310313R, 333150, 375 1, G06G 7195, H03H 925

Patent

active

052629775

ABSTRACT:
A convolver has a piezoelectric film layer, an insulator layer and a semi-conductor layer. A surface resistance measurement part permits measurement of a surface resistance related to the surface resistance seen by a gate electrode of the convolver. The surface resistance part is changeable by a bias voltage applied to the convolver. The amplitude of the bias voltage is controlled to set the surface resistance at a value which produces a desired convolution efficiency of the convolver. The convolver is adaptable to be fabricated as an integrated circuit with a simple structure. A transmitter/receiver system is disclosed in which a transmitted SSC signal is modulated by a pseudo-noise (PN) signal, as well as by a normal modulation. In the receiver, the PN component of the signal is removed using a convolver according to the present invention, to correlate the received signal before detection thereof.

REFERENCES:
patent: 3809931 (1974-05-01), White et al.
patent: 4342971 (1982-08-01), Councilman et al.
patent: 4639697 (1987-01-01), Yarranton et al.
patent: 4691326 (1987-09-01), Tsuchiya
patent: 4967113 (1990-10-01), Mitsutsuka

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