Method and apparatus for compensating for tuning nonlinearity of an oscillator
US7728690B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 19, 2007 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | Dec 5, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Techniques to compensate for nonlinearity of a tuning function of an oscillator are described. The tuning nonlinearity of the oscillator may be modeled as a disturbance input to the oscillator and may be compensated with an equal but opposite disturbance. In one design, a nonlinearity correction signal to compensate for the tuning nonlinearity may be generated, e.g., based on a phase error signal in a phase-locked loop (PLL) and a scaling factor determined adaptively. The nonlinearity correction signal may compensate for the n-th (e.g., second) order tuning nonlinearity, and an n-th order (e.g., squared) modulating signal may be used to derive the scaling factor and the nonlinearity correction signal. A control signal for the oscillator may be generated based on the nonlinearity correction signal and possibly one or more other signals. The control signal may be applied to the oscillator to adjust the oscillation frequency of the oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.