Quadrature modulator having compensation for local oscillator leak
US5012208A · kind A · utility
26Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1990 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Apr 10, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C1/52
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a quadrature modulator comprising a circuit for the compensation of a local oscillator leak signal in an output signal of the modulator, which circuit adds different compensation voltages to two modulation signals. To provide an automatic compensation of the local oscillator leak signal, the quadrature modulator of the invention comprises a regulating circuit for the regulation of the intensity of the compensation voltages irrespective of each other on the basis of the correlation between the amplitude variation in the output signal and the corresponding modulation signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.