发明名称 |
Communication semiconductor integrated circuit device and wireless communication system |
摘要 |
A communication semiconductor integrated circuit device is capable of transmission in two or more different modulation modes and outputting transmission signals with less distortion. The communication semiconductor integrated circuit device comprises a gain variable amplification circuit which amplifies I-signals and Q-signals; and a mixer circuit which synthesizes the amplified I-signals and Q-signals and local oscillation signals to carry out modulation and frequency conversion. The communication semiconductor integrated circuit device is capable of transmission in two or more different modulation methods, for example, in GSM mode and EDGE mode. A low-pass filter of second or higher order is placed between the gain variable amplification circuit and the mixer circuit.
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申请公布号 |
US2004229592(A1) |
申请公布日期 |
2004.11.18 |
申请号 |
US20040816817 |
申请日期 |
2004.04.05 |
申请人 |
MATSUI HIROAKI;HORI KAZUAKI |
发明人 |
MATSUI HIROAKI;HORI KAZUAKI |
分类号 |
H04B1/707;H04B1/04;H04B1/40;(IPC1-7):H04B1/28 |
主分类号 |
H04B1/707 |
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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