Radiofrequency transmitter with a high degree of integration and possibly with self-calibrating image deletion
US6668024B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2000 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Mar 6, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/166
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A radio frequency transmitter, of the type supplied with two signals in baseband and in quadrature, I(nT) and q(nT), which are images from two binary streams representing information to be transmitted, 1) provides a first transposition into the digital domain, at an intermediate frequency &ohgr;0, for the baseband signals and generates, by combination, two signals of intermediate frequency in quadrature, 2) provides a second transposition into the analog domain, after multiplication by a frequency &ohgr;1, followed by a summation of the two signals at intermediate frequency and in quadrature, in such a way that a resultant signal is generated which is found finally around a frequency &ohgr;2, where &ohgr;2=&ohgr;0+&ohgr;1. In an advantageous variant, the radio frequency transmitter additionally digitally compensates gain and phase imperfections of the direct conversion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.