Quadrature signals generator
US4908532A · kind A · utility
15Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 8, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Jul 8, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0812
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A quadrature signal generator is provided which includes a voltage dependent resistance capacitance phase-shifting network (12) and a phase detector (26) for detecting any difference, from 90.degree., between the phases of the in-phase and quadrature phase signals (2, 24) generated by the network (12) and for producing a control signal in dependence upon such difference. The control signal is applied to the network (12) to vary the phase-shifting characteristic thereof to restore and maintain the 90.degree. phase difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.