发明授权
- 专利标题： RF tunable filter arrangement with tunable image trap
- 专利标题（中）： RF可调滤波器布置，带可调图像陷波器
-
申请号： US08572550申请日： 1995-12-14
-
公开(公告)号： US06553216B1公开(公告)日： 2003-04-22
- 发明人: Michael Anthony Pugel , Gary Dean Grubbs
- 申请人： Michael Anthony Pugel , Gary Dean Grubbs
- 主分类号： H04B118
- IPC分类号： H04B118
摘要：
A tuner includes a tunable filter for selecting a desired RF signal in response to a tuning control signal and a tunable image trap 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 and a mixer. The tunable trap also serves as an impedance transformation element between the tunable filter and said mixer. 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.