Monolithic elastic convolver output circuit
US4870376A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1983 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Dec 15, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06G7/195
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to a microstrip circuit which is used to combine the energy output from the convolving plate of a surface acoustic wave (SAW) monolithic elastic convolver. The convolving plate is tapped at its two ends and a Wilkinson combiner is used to sum the signals that propagate to the ends of the plate. The Wilkinson combiner is a three-port device with the two arms that couple to the convolver plate having their characteristic impedances set to match that of the acoustic waveguide. In view of the impedance match, no electromagnetic reflections are produced at the end of the convolving plate and all of the energy incident on the Wilkinson combiner is summed and delivered to the output port of the combiner. Additionally, the microstrip circuit has an impedance transformer to transform down to an impedance suitable for driving an output amplifier chain of a receiving system. In accordance with a second embodiment of the invention, a plurality of convolvers is connected together in a Christmas tree-type of arrangement to maintain spatial amplitude uniformity while minimizing the phase delay that occurs from propagation from the center of the elastic convolver to the oute…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.