Communication semiconductor integrated circuit and radio communication system
US6900700B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 26, 2003 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Apr 23, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/193
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A communication semiconductor integrated circuit has an oscillator circuit forming part of a transmission PLL circuit fabricated on a single semiconductor chip together with an oscillator circuit forming part of a reception PLL circuit and an oscillator circuit for an intermediate frequency. The oscillator circuit forming part of the transmission PLL circuit is configured to be operable in a plurality of bands. A circuit for measuring the oscillating frequency of the oscillator circuit forming part of the transmission PLL circuit is also used for measuring the oscillating frequency of the oscillator circuit forming part of the reception PLL circuit or for measuring the oscillating frequency of the oscillator circuit for the intermediate frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.