发明名称 |
Tuner with calibration of center frequency of IF notch filter and calibration of S-Meter |
摘要 |
A center frequency F0 of an IF filter is effectively adjusted. The IF filter (14) filters a down-converted signal centering around the center frequency F0. A pseudo sine wave generation circuit (20) generates a pseudo sine wave having a level change of at least two steps respectively on both positive and negative sides. The pseudo sine wave is made to pass through the IF filter (14) by a switch circuit (22), and in this state, an F0 adjustment circuit (24) adjusts the center frequency F0 in the IF filter (14) by comparing a phase of the pseudo sine wave with a phase of the signal after passing through the IF filter (14). |
申请公布号 |
EP2658121(A2) |
申请公布日期 |
2013.10.30 |
申请号 |
EP20130164772 |
申请日期 |
2013.04.22 |
申请人 |
SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC |
发明人 |
KANZAWA, TOMOYA;KURIHARA, SHINJI;HORIKOSHI, KATU |
分类号 |
H04B17/21;H03H7/01;H03H11/12;H03J7/04 |
主分类号 |
H04B17/21 |
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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