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    • 5. 发明授权
    • Tunable filter and portable telephone
    • 可调滤波器和便携式电话
    • US07135940B2
    • 2006-11-14
    • US11039872
    • 2005-01-24
    • Takashi KawakuboRyoichi OharaKazuhide AbeHiroshi YoshidaHiroshi Tsurumi
    • Takashi KawakuboRyoichi OharaKazuhide AbeHiroshi YoshidaHiroshi Tsurumi
    • H03H21/00H03H9/54H03H9/64
    • H03J3/08H03H9/542H03H9/605H03H2210/012H03H2210/015H03J1/0008
    • A tunable filter has a plurality of variable capacitors and a plurality of inductor elements, each being formed on a common substrate, a filter circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a monitor circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a detecting circuit which detects a prescribed circuit constant of the monitor circuit, a storage which stores information relating to a reference circuit constant of the monitor circuit, and a capacitance control circuit which controls capacitance of the variable capacitors in the monitor circuit and capacitance of the variable capacitors in the filter circuit, based on a result detected by the detecting circuit and information stored in the storage.
    • 可调谐滤波器具有多个可变电容器和多个电感器元件,每个电感器元件形成在公共基板上,通过使用多个可变电容器的至少一部分和多个电感器元件的一部分形成的滤波器电路, 通过使用多个可变电容器的至少一部分和多个电感器元件的一部分形成的监视电路,检测监视电路的规定电路常数的检测电路,存储与参考电路有关的信息的存储器 基于由检测电路检测的结果和存储在存储器中的信息,控制监视电路中的可变电容器的电容和滤波器电路中的可变电容器的电容的电容控制电路。