发明名称 |
High frequency semiconductor integrated circuit and radio communication system |
摘要 |
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 for the transmission PLL circuit is configured to be operable in a plurality of bands. The communication semiconductor integrated circuit also comprises a circuit for measuring the oscillating frequency of the oscillator circuit for the transmission PLL circuit, and a storage circuit for storing the result of measurement made by the measuring circuit. A band to be used by the oscillator circuit for the transmission PLL circuit is determined based on values for setting the oscillating frequencies of the oscillator circuit forming part of the reception PLL circuit and the intermediate frequency oscillator circuit, and the result of measurement stored in the storage circuit. |
申请公布号 |
GB2393049(B) |
申请公布日期 |
2005.09.28 |
申请号 |
GB20020021303 |
申请日期 |
2002.09.13 |
申请人 |
* HITACHI, LTD.;* TTPCOM LIMITED;* RENESAS TECHNOLOGY CORP |
发明人 |
HIROTAKA * OOSAWA;JIRO * SHINBO;NORIYUKI * KURAKAMI;MASUMI * KASAHARA;ROBERT ASTLE * HENSHAW |
分类号 |
H03B1/00;H03B5/12;H03D3/00;H03J1/00;H03L7/089;H03L7/099;H03L7/10;H03L7/18;H03L7/187;H03L7/193;H04B1/40;H04L27/00;(IPC1-7):H03L7/18;H03J7/06 |
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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