发明授权
- 专利标题： Impedance circuit, and filter circuit, amplifier circuit, semiconductor integrated circuit, electronic component, and wireless communications device using the same
- 专利标题（中）： 阻抗电路，滤波电路，放大电路，半导体集成电路，电子元器件及使用其的无线通信装置
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申请号： US10944693申请日： 2004-09-17
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公开(公告)号： US07218185B2公开(公告)日： 2007-05-15
- 发明人: Toru Watanabe , Makoto Inoguchi
- 申请人： Toru Watanabe , Makoto Inoguchi
- 申请人地址： JP
- 专利权人： Seiko Epson Corporation
- 当前专利权人： Seiko Epson Corporation
- 当前专利权人地址： JP
- 代理机构： Harness, Dickey & Pierce, P.L.C.
- 优先权： JP2003-331598 20030924; JP2003-331599 20030924; JP2004-133684 20040428
- 主分类号： H01P1/10
- IPC分类号： H01P1/10 ; H03H7/38
摘要：
A filter circuit is provided wherein one end of an inductor is connected to one end of a capacitor to form a signal input end. The other end of the inductor is connected to a first switch circuit, and the other end of the capacitor is connected to a second switch circuit. When a lower-frequency signal in a 2.4 GHz band is to be inputted, a low-pass filter circuit is formed by connecting the other end of the inductor to a signal output end and the other end of the capacitor to ground, and when a higher-frequency signal in a 5 GHz band is to be inputted, a high-pass filter circuit is formed by connecting the other end of the inductor to ground and the other end of the capacitor to the signal output end, by manipulating the first and second switch circuits.
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