Communication semiconductor integrated circuit and radio communication system
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United States of America Patent
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May 31, 2005
Grant Date -
Mar 18, 2004
app pub date -
Feb 26, 2003
filing date -
Sep 13, 2002
priority date (Note) -
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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.
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