Surface wave device angle modulator
US3949324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Nov 11, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/40
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system for generating angular modulation comprising a balanced modulator and an adding circuit to which a surface wave device quadrature oscillator applies two signals at the carrier frequency differing 90.degree. in phase, such phase difference being accurately maintained independent of aging and variations in operating temperatures. More particularly, an information signal is applied to one input of the balanced modulator, the output of which is applied to the adding circuit. The surface wave device oscillator completes the system by applying an in-phase carrier frequency to a second input of the balanced modulator and a carrier frequency shifted 90.degree. in phase to a second input of the adding circuit. Angular modulation is thus produced at the output of the adding circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.