发明名称 |
RF FILTER ARRANGEMENT WITH IMAGE TRAP |
摘要 |
A tuner includes a tunable filter (907-2) for selecting a desired RF signal in response to a tuning control signal and a tunable image trap (907-3) for rejecting the undesired image signal corresponding to the desired RF signal responsive to the tuning control signal coupled in cascade between an RF amplifier (905) and a mixer (909). The tunable trap (907-3) also serves as an impedance transformation element between the tunable filter (907-2) and said mixer (909). The arrangement is particularly useful in a tuner in which the frequency range of the local oscillator signal is below the frequency range of the received RF signals.
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申请公布号 |
CA2190904(C) |
申请公布日期 |
2001.02.27 |
申请号 |
CA19962190904 |
申请日期 |
1996.11.21 |
申请人 |
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发明人 |
PUGEL, MICHAEL ANTHONY;GRUBBS, GARY DEAN |
分类号 |
H04N5/44;H03D7/18;H03F3/191;H03H7/12;H03J3/08;H03J3/20;H03J3/26;H03J5/24;H04B1/06;H04B1/10;(IPC1-7):H03J3/02;H04B1/26;H04N5/50 |
主分类号 |
H04N5/44 |
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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