System and method for an improved quadrature upconverter for I/Q modulation using intermediate frequency carriers
US7206357B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2003 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Oct 28, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0018
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A signal transmitter for sending a radio signal is made up of an input for receiving input data and a first circuit for generating an inphase signal and a quadrature signal from the input data. A second circuit produces a first signal associated with a cosine of a first frequency and a third circuit that produces a second signal associated with a sine of the first frequency. A first modulator, coupled to the first circuit and the second circuit, upconverts the inphase signal with the first signal and produces a first upconverted signal. A second modulator, coupled to the first circuit and the third circuit, upconverts the inphase signal with the second signal and produces a second upconverted signal. A third modulator, coupled to the first circuit and the second circuit, upconverts the quadrature signal with the first signal and produces a third upconverted signal. A fourth modulator, coupled to the first circuit and the third circuit, upconverts the quadrature signal with the second signal and produces a fourth upconverted signal. A fourth circuit, coupled to the first and fourth modulators, combines the first upconverted signal and the fourth upconverted signal into a first inter…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.