Invention Grant
- Patent Title: Switch-able band-tracking input filter for combination tuner
- Patent Title (中): 用于组合调谐器的可切换带通跟踪输入滤波器
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Application No.: US11574972Application Date: 2005-09-02
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Publication No.: US08155609B2Publication Date: 2012-04-10
- Inventor: Yeow T. Toh , Kam C. Kwong
- Applicant: Yeow T. Toh , Kam C. Kwong
- Applicant Address: NL Eindhoven
- Assignee: NXP B.V.
- Current Assignee: NXP B.V.
- Current Assignee Address: NL Eindhoven
- Priority: EP04300584 20040908
- International Application: PCT/IB2005/052881 WO 20050902
- International Announcement: WO2006/027733 WO 20060316
- Main IPC: H04B1/18
- IPC: H04B1/18

Abstract:
The present invention relates to a combination RF tuner capable of receiving signals from the FM radio band and from the TV band. Prior art combination tuners had to compromise in quality resulting in combination tuners that neither exhibited high-end FM nor TV-signal reception behavior. A combination RF tuner capable of optimal receiving an FM-radio signal type and a TV signal type, comprising a switch-able tuned input filter (440), is proposed. One response of the input filter (440) provides a sufficient big bandwidth for enabling reception of the TV-signal type. The input filter (440) of the invention can be switched, providing a second response that has a smaller bandwidth for enabling reception of the FM-radio signal type. The second response can be realized by substantially bypassing an 10 inductive element (450) (e.g., comprising a inductor, L21, in series with a damping resistor, R3) of the input filter (440).
Public/Granted literature
- US20090215415A1 SWITCH-ABLE BAND-TRACKING INPUT FILTER FOR COMBINATION TUNER Public/Granted day:2009-08-27
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