System for highly linear phase modulation
US7061341B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 2004 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Jun 26, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2042
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
System for highly linear phase modulation. Apparatus is provided for linear phase modulation utilizing a phase-locked loop (PLL). The apparatus includes a PLL utilizing fractional N synthesis to realize a non-integer divide value. A two-port voltage-controlled oscillator includes a first port controlled by the phase-locked loop and a second port accessed for direct modulation. A second input to the fractional-N phase-locked loop is provided to remove the modulation introduced at the second port. Lastly, a calibration loop is provided wherein a frequency offset applied at the second port is adjusted until it cancels the effects of a known frequency offset introduced to the fractional-N phase-locked loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.