Communication semiconductor integrated circuit device and a wireless communication system
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United States of America Patent
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Mar 17, 2009
Grant Date -
Mar 8, 2007
app pub date -
Nov 6, 2006
filing date -
Nov 16, 2001
priority date (Note) -
Expired
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Abstract
In a communication semiconductor integrated circuit device, an oscillator of a PLL circuit can operate in a plurality of frequency bands. With a control voltage (Vc) of the oscillator fixed to a predetermined value (VDC), an oscillation frequency of the oscillator is measured for each band to be stored in a storage. When the PLL operates, a setting value to specify a band is compared with the measured frequency values stored in the storage. As a result of the comparison, a band to be actually used by the oscillator is determined.
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