发明名称 |
Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus |
摘要 |
A tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit changes a resistance of the tuning circuit when resonant. The resistance-adjustment circuit comprises a series circuit of a resistor and a switching element having an ON-resistance smaller than the resistance of the resistor, and turning on/off the switching element causes the resistance of the tuning circuit when resonant to change. |
申请公布号 |
EP1538751(A2) |
申请公布日期 |
2005.06.08 |
申请号 |
EP20040257480 |
申请日期 |
2004.12.01 |
申请人 |
SANYO ELECTRIC CO., LTD.;TOKYO UNIVERSITY OF SCIENCE |
发明人 |
UMEWAKA, MASAHIRO;YAMAMOTO, HIROYA;SEKINE, KEITAROU;HYOUGO, AKIRA;MORIJIRI, KEIJI |
分类号 |
H03G3/20;G06K19/07;H03G3/30;H03J3/18;H03J3/20;H03J5/24 |
主分类号 |
H03G3/20 |
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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