Magnetostatic-wave device
US4679012A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1986 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Mar 31, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2/001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Transversal characteristic filter using a magnetostatic-wave device having amplitude weighted transducer assemblies. The input transducer includes a multi-fingered conductive layer with each finger being equally dimensioned and spaced. Each finger is separately connected to a contact of a field effect transistor integrated onto a semiconductor chip. A separate transistor is available for connection to each finger. The contact widths of the transistors vary depending upon the location of the connected finger from the center-most finger. A distribution approaching sin(x)/x is desirable in most applications. At the output or combining end of the device, the transducer fingers are separately connected to the gates of individual transistors whose junction widths vary symmetrically about the width of the junctions of the transistor connected to the center-most finger. Phase reversal is provided for fingers which are sufficiently displaced to be aligned with the side lobes of the sin(x)/x current distribution, at both the input and output transducers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.