Apparatus and method for compensating carrier feedthrough in quadrature modulation system
US7671692B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 10, 2008 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Oct 17, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/406
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an apparatus and a method for compensating carrier feedthrough in a quadrature modulation system. In order to suppress the carrier feedthrough, and minimize and compensate the carrier feedthrough, differences of baseband differential input DC voltages in an in-phase as well as a quadrature-phase are simultaneously adjusted to 0 or a certain slight voltage difference by a simple analog circuit. Therefore, it is possible to suppress carrier feedthrough using a simple analog type apparatus for compensating carrier feedthrough, and simply achieve an apparatus for carrier feedthrough using a variety of quadrature modulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.