The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 1977
Filed:
Apr. 14, 1976
Thomas Macklin Reeder, Glastonbury, CT (US);
Thomas Walter Grudkowski, Manchester, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A surface acoustic wave (SAW) tapped delay line, including a piezoelectric substrate having a pair of signal launching transducers disposed thereon for providing surface acoustic waves in the substrate in response to electrical signals applied thereto, and including a plurality of transducer taps disposed in an interaction region of the substrate for providing a plurality of sensed electrical signals in response to the surface acoustic waves propagating through the interaction region, the plurality of sensed electrical signals including signals at the frequency of each of the acoustic waves, is combined with a plurality of nonlinear frequency mixers, each responsive to a corresponding one of the transducer taps, and each providing signal manifestations of the sum and different frequencies of the surface acoustic waves in a selected one of two phases which are displaced by 180.degree. with respect to each other, and at signal amplitudes which are selectively adjustable to provide a desired transducer tap amplitude weighting. The selectively adjustable phase and amplitude of the nonlinear frequency mixer signal manifestations provide a programmable SAW delay line suitable for use as a programmable, amplitude and phase, general transversal filter having high programming speed and low power consumption.