Invention Grant
US08427586B2 Tuner comprising an IF filter with a controllable damping stage and receiver comprising a respective tuner
失效
调谐器包括具有可控阻尼级的IF滤波器和包括相应调谐器的接收器
- Patent Title: Tuner comprising an IF filter with a controllable damping stage and receiver comprising a respective tuner
- Patent Title (中): 调谐器包括具有可控阻尼级的IF滤波器和包括相应调谐器的接收器
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Application No.: US12735423Application Date: 2009-01-27
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Publication No.: US08427586B2Publication Date: 2013-04-23
- Inventor: Kim Suan Pang , Vinod Menon
- Applicant: Kim Suan Pang , Vinod Menon
- Applicant Address: FR Issy-les-Moulineaux
- Assignee: Thomson Licensing
- Current Assignee: Thomson Licensing
- Current Assignee Address: FR Issy-les-Moulineaux
- Agency: Myers Wolin, LLC
- Priority: EP08300059 20080130
- International Application: PCT/EP2009/050877 WO 20090127
- International Announcement: WO2009/095379 WO 20090806
- Main IPC: H04N5/50
- IPC: H04N5/50 ; H04N5/44

Abstract:
The tuner comprises an RF input for receiving a high frequency signal, a downconverter including a mixer for downconverting the high frequency signal, an IF filter coupled to an output of the mixer, an SAW filter coupled to an output of the IF filter and a gain-controlled IF amplifier coupled to an output of the SAW filter for providing an amplified IF signal for a subsequent demodulator. The IF filter includes a controllable damping stage which is in particular usable for improving the noise performance of the tuner. The tuner is designed in a preferred embodiment for reception of analog and digital television signals and the controllable damping stage provides a damping in case of reception of an analog television signal for improving a signal/noise ratio of the analog television signal. The damping stage comprises for example a switching stage utilizing one or several varactor diodes as damping elements.
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