发明名称 |
Catv tuner apparatus |
摘要 |
<p>A CATV tuner apparatus (37) includes a first low-noise amplifier (31) which amplifies an input signal received at an input terminal, the first low-noise amplifier (31) having an adequately small noise figure to allow the received input signal to be amplified with no substantial degradation of a carrier-to-noise ratio of the input signal. An automatic gain control (32) detects the level of the signal amplified by the first low-noise amplifier (31) and adjusts the amplitude of the signal. A band-pass filter (33) eliminates out-of-band signal components from the signal received from the automatic gain control (32) and passes only in-band signal components. A second low-noise amplifier (34) amplifies the signal received from the band-pass filter (33). A frequency multiplier (35) produces an intermediate frequency signal (IF) at an output terminal by multiplication of the signal that is amplified by the second low-noise amplifier (34), with a signal output from a local oscillator (36). <IMAGE></p> |
申请公布号 |
EP1014569(A1) |
申请公布日期 |
2000.06.28 |
申请号 |
EP19990310417 |
申请日期 |
1999.12.22 |
申请人 |
MITSUMI ELECTRIC CO., LTD. |
发明人 |
OGINO, TOSHIKAZU;YAMASAKI, MASASHIGE;SHIBANO, HAYATO |
分类号 |
H04B1/18;H03G3/20;(IPC1-7):H03G3/20 |
主分类号 |
H04B1/18 |
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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