United Technologies Corporation

Gary K Montress

Thomas W Grudkowski

Thomas M Reeder

Donald E Cullen

Meyer Gilden

Sears W Merritt

Robert A Wagner

A large bandwidth, tapped delay line (TDL) surface acoustic wave (SAW) adaptive processor arrangement, for processing a plurality of array values employed as tap weights in the TDL device. The weight quantities may be real or complex. In the complex case, no phase quadrature combiner is required as a result of the technique of offsetting the real and imaginary delay lines, or offset launching of the frequency waveforms to be mixed.

Large bandwidth SAW adaptive processor arrangement

Large bandwidth saw adaptive processor arrangement

A strain isolation technique for a surface acoustic wave (SAW) device having a piezoelectric SAW substrate is disclosed. A cut in the surface of the piezoelectric SAW substrate forms an isolated surface region where active SAW signal propagation occurs. The cut prevents undesirable surface strains from affecting SAW signal propagation in the isolated region.

Strain relief technique for surface acoustic wave devices

A SAW signal processor (20) includes a plurality of FET taps (30-32) having individually programmable source-drain bias (42-44) which controls both the amplitude and phase of the mixing efficiency of internal product mixing of the waves passing beneath the tap, in dependence upon the amplitude and polarity of the bias, the sources (34) of the taps may be interconnected so as to provide a summation of correlation at the output (40). The gates (35) of each of the taps are ohmically isolated, thereby to mitigate intertap interaction. The invention is a direct improvement over U.S. Pat. No. 4,207,546.

Isolated gate, programmable internal mixing saw signal processor

Signals extracted from the taps of a surface acoustic wave (SAW) device, as a consequence of a single wave propogating therein or as a consequence of interaction between a pair of waves propagating therein, are processed by linearly-controlled nonlinear product mixing and/or amplifying devices, to provide output signals in a serial chain of chips of RF, the magnitude of chips being dependent upon unique, selected bias applied to corresponding ones of the devices. The devices may be diodes operating in a bias range to provide impedence greater than the capacitive reactance impedance of the taps to which they are attached, thereby providing a linear RF voltage to DC bias current characteristic, while at the same time providing a nonlinear DC voltage to DC current characteristic for RF product mixing (where used); or the devices may comprise transistors, either field effect or bipolar, with similar suitable bias considerations when linearly-controlled product mixing is desired. Applications, with or without output frequency isolation from input frequencies, include time division multiplexing of DC signals (such as transducer output signals), and transversal filtering, of the type useful in correlation or other wave or coded signal analysis.

Linear SAW signal processor

A surface acoustic wave signal processor having a plurality of taps, each connected to an external nonlinear device are arranged in pairs, each pair having its phase center aligned for interception of propagating waves at the same transversal distance from the launching thereof, the taps having configurations so that each tap in the pair receives signals at a phase which is inverted (180.degree. out of phase) with respect to corresponding signals received at the other tap of the pair, the product mixing output of the external nonlinear device for each tap being summed with the like output for the other tap in the pair, whereby all waves intercepted by the tap pair are cancelled at the product mixer outputs, along with certain of the components of product mixing having odd-ordered exponents. Disclosed configurations include tilted taps with co-propagating waves, longitudinally aligned taps with counter-propagating waves, and co-linear taps with plural channel, transversally displaced waves. Usage with internal mixing is also described.

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Glastonbury, CT, United States of America

Gary K Montress