Quadrature modulated phase-locked loop
US5313173A · kind A · utility
130Cited by
7References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1993 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | Apr 26, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/22
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase-locked loop incorporates a quadrature modulator for generating constant envelope phase or frequency modulation. Locating the quadrature modulator within the feedback loop or feeding the output signal of the quadrature modulator into the feedback loop permits accurate constant envelope phase modulation of the loop reference oscillator and completely suppresses undesired AM and PM components of the modulated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.