发明名称 |
Automatic tuning apparatus for filter and communication instrument |
摘要 |
An automatic tuning apparatus for a filter includes a mode wherein a switching part is controlled so that a reference signal is inputted to the filter, a plural number of control signals are successively input to a control terminal of the filter, a tentative value of the control signal is determined based on respective amplitudes detected by an amplitude detection part as a "coarse tuning step", a plural number of control signals are successively input in the vicinity of the tentatively determined value to a control terminal, and the value of the control signal is determined to be used in a mode as a "fine tuning step" based on respective phase differences detected by a phase comparator part".
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申请公布号 |
US7400868(B2) |
申请公布日期 |
2008.07.15 |
申请号 |
US20040007620 |
申请日期 |
2004.12.08 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
FUKUSEN MASARU;KURODA SHUICHI |
分类号 |
H03H11/04;H04B1/18;H03J1/00;H04B1/10;H04B1/16 |
主分类号 |
H03H11/04 |
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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