Direct digital polar modulator
US6834084B2 · kind B2 · utility
54Cited by
19References
17Claims
0Family size
Inventor
Key dates
| Filing date | May 6, 2002 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/222
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A polar modulator creates an amplitude signal and a frequency signal and digitally adjusts the signals so that the frequency and amplitude signals arrive at the power amplifier at the appropriate times. A digital predistortion filter is applied to the frequency signal. The frequency signal is then provided to a single port of a fractional N divider in a phase locked loop. The output of the phase locked loop drives an input of the power amplifier while the amplitude signal is converted to an analog signal and controls the power supply input of the power amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.