Method and apparatus for generating a modulated signal
US5838210A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1997 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Dec 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/66
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for generating a modulated signal include a pulse modulation source (215), a pulse modulator (20) for modulating a pulsed signal, a high efficiency power amplifier (230) for amplifying the modulated pulsed signal, and a harmonic reduction filter (240) for passing the switching frequency of the pulsed signal as the RF carrier. The pulse modulation source (215) accepts baseband inphase and quadrature signals and determines phase values and duty ratios for modulating the pulsed signal. The pulse modulator (20) phase modulates and duty cycle modulates the pulsed signal before it is amplified and filtered. A quadrature demodulator (260) produces baseband inphase and quadrature feedback signals for increased linearity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.