Method and apparatus for an adaptive step frequency calibration
US8090335B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2006 |
| Grant date | Jan 3, 2012 |
| Priority date | — |
| Expiry date | Apr 8, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/113
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An open loop frequency calibration algorithm is employed whereby frequency counters are utilized to provide frequency information concerning the difference in frequency between a local oscillator and a reference signal prior to obtaining phase locked operation of a phase locked loop (PLL). The frequency difference is then used to adjust the local oscillator's frequency to be changed by a value that is proportional to the frequency difference measured. Through adaptive calibration of the local oscillator's frequency prior to closed loop PLL operations, a substantial reduction in the amount of time required to obtain phase/frequency coherent operation of the PLL is realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.