Frequency calibration of radio frequency oscillators
US8130046B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2009 |
| Grant date | Mar 6, 2012 |
| Priority date | — |
| Expiry date | Jun 5, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A wireless communication device incorporating a set of comparators and logic interrupt into the local oscillator generation circuit block is described. In one design, the local oscillator circuit block includes a RF VCO with coarse and fine frequency tuning. The RF VCO fine frequency tuning signal is monitored continuously to determine if the control voltage is within specified limits. If the RF VCO fine frequency tuning voltage is too low or too high for the RF VCO to meet system requirements or lock on the current desired frequency, an interrupt signal is asserted. In response to the interrupt signal, a wireless communications processor or a hardware state machine initiates coarse frequency calibration of the RF VCO at the desired frequency. After coarse frequency calibration has completed, the RF VCO fine frequency tuning voltage is within specified limits and is continuously monitored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.