System and method for crystal oscillator frequency tuning
US8138844B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2010 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Sep 10, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator may include a crystal resonator, an inverter coupled in parallel with the crystal resonator, a first switched capacitor coupled to a first terminal of the crystal resonator, a second switched capacitor coupled to a second terminal of the crystal resonator, a control module configured to output a periodic dithering signal, the periodic dithering signal having a first pulse width based on a desired frequency of oscillation for the oscillator, and a delay module configured to communicate a first periodic enable signal to enable the first switched capacitor and a second periodic enable signal to enable the second switched capacitor. At least one of the first periodic enable signal and the second periodic enable signal may have a second pulse width greater than the first pulse width. The second periodic enable signal may be phase delayed relative to the first periodic enable signal by a non-zero delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.