Method and apparatus for calibrating a reference oscillator
US7139530B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 2002 |
| Grant date | Nov 21, 2006 |
| Priority date | — |
| Expiry date | Mar 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/29
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for calibrating a reference oscillator and use of a calibrated reference oscillator is disclosed. To gain cost reduction advantages, a less accurate reference oscillator is utilized in a wireless communication device. The cost benefit is gained at the expense of reference oscillator accuracy in that its inability to generate a signal with a highly accurate reference frequency inhibits acquisition of a carrier or pilot signal. To compensate, a correction factor is generated by minimizing the difference between the reference oscillator signal and a signal of known frequency, such as an external reference signal. Access to the reference oscillator signal, or a signal related thereto, may be gained via the communication device antenna or a test port. The correction factor may be stored in the wireless communication device for use in conjunction with the reference oscillator to thereby generate the highly accurate reference signal at the reference frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.