Phase based vector modulator
US5093636A · kind A · utility
112Cited by
12References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1990 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | Sep 25, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/0294
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Vector modulation is effected by summing output signals from two phase modulators. The lack of amplitude modulation on the signals when summed permits non-linear processing of the signals, such as PLL frequency translation. In one embodiment, the phase modulators comprise fractional-N phase locked loops modulated with digital data words. In another, the phase modulators comprise direct digital synthesizers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.