Harmonic-rejection modulation device
US7518459B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2006 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | May 22, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0086
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A harmonic-rejection modulation device is provided, which includes a phase splitter, a low pass filter, and a modulator. Based on a square wave, the phase splitter generates a plurality of unfiltered local oscillating signals having phase angles of 0°, 30°, 90°, 120°, 180°, 210°, 270° and 300°, respectively. The low pass filter filters the high frequency components of the unfiltered local oscillating signals to generate a plurality of local oscillating signals having phase angles of 0°, 30°, 90°, 120°, 180°, 210°, 270° and 300°, respectively. The modulator modulates a baseband signal with the local oscillating signals, wherein the third harmonics of the local oscillating signals are eliminated by the modulation process of the modulator. The invention also provides a method of modulating a baseband signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.