Communication semiconductor integrated circuit device for use in a mobile communication device for correcting variations in the oscillation frequency of a transmission oscillator by calibrating a current of the charge pump
US7450921B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2007 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Jan 11, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/16
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention provides a communication semiconductor integrated circuit (RF IC) that, when a transmission oscillator is incorporated into a semiconductor chip, secures the oscillation operation over a wide frequency range, prevents a deterioration of a transmission spectrum, and thereby enhances the accuracy of an oscillation frequency. The integrated circuit corrects a dispersion of the KV characteristic of the transmission oscillator by calibrating a current Icp of the charge pump inside the phase control loop. More in concrete, the integrated circuit measures a KV value Kv of the transmission oscillator, and calibrates the current Icp of the charge pump so that Kv·Icp falls into a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.