发明名称 |
Communication semiconductor integrated circuit device and a wireless communication system |
摘要 |
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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申请公布号 |
US7504903(B2) |
申请公布日期 |
2009.03.17 |
申请号 |
US20060592982 |
申请日期 |
2006.11.06 |
申请人 |
RENESAS TECHNOLOGY CORP.;TTPCOM LIMITED |
发明人 |
KASAHARA MASUMI;OSAWA HIROTAKA;HENSHAW ROBERT ASTLE |
分类号 |
H03B1/00;H03L7/10;H03L7/099;H03L7/187;H04B1/26;H04B1/40 |
主分类号 |
H03B1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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