发明名称 |
IMPEDANCE CIRCUIT NETWORK, AND FILTER CIRCUIT, AMPLIFIER CIRCUIT, SEMICONDUCTOR INTEGRATED CIRCUIT, ELECTRONIC COMPONENT AND WIRELESS COMMUNICATIONS DEVICE USING THE SAME |
摘要 |
PROBLEM TO BE SOLVED: To achieve a filter circuit capable of operating in response to a plurality of frequency bands without deteriorating a filter characteristic. SOLUTION: One end of an inductor L1 is connected to one end of a capacitor C to form a signal input end. The other end of the inductor L1 is connected to a switch circuit SW1, and the other end of the capacitor C is connected to a switch circuit SW2. 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 L1 to a signal output end and the other end of the capacitor C to a ground, and when a higher-frequency signal in a 5 GHz band is to be inputted, a high-pass filter is formed by connecting the other end of the inductor L1 to the ground and the other end of the capacitor C to the signal output end, by manipulating the switch circuits SW1 and SW2. COPYRIGHT: (C)2005,JPO&NCIPI
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申请公布号 |
JP2005124126(A) |
申请公布日期 |
2005.05.12 |
申请号 |
JP20040133684 |
申请日期 |
2004.04.28 |
申请人 |
SEIKO EPSON CORP |
发明人 |
WATANABE TORU;INOGUCHI MAKOTO |
分类号 |
H03H7/075;H03H7/01;H03H7/12;H03H7/38;H03H7/46;(IPC1-7):H03H7/075 |
主分类号 |
H03H7/075 |
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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