发明公开
EP2452439A1 USING LO SHIFTING TO PREVENT A LOCAL TRANSCEIVER FROM INTERFERING WITH AN FM RADIO
审中-公开
LOKALOSZILLATORVERSHIEBUNG为防止产生的FM接收器收发器问题
- 专利标题： USING LO SHIFTING TO PREVENT A LOCAL TRANSCEIVER FROM INTERFERING WITH AN FM RADIO
- 专利标题（中）： LOKALOSZILLATORVERSHIEBUNG为防止产生的FM接收器收发器问题
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申请号： EP10733091.2申请日： 2010-07-08
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公开(公告)号： EP2452439A1公开(公告)日： 2012-05-16
- 发明人: TRIKHA, Pushp, K. , BLESSENT, Luca , LI, Xiaoyong , APTE, Rahul, A.
- 申请人： Qualcomm Incorporated
- 申请人地址： Attn: International IP Administration 5775 Morehouse Drive San Diego, CA 92121 US
- 专利权人： Qualcomm Incorporated
- 当前专利权人： Qualcomm Incorporated
- 当前专利权人地址： Attn: International IP Administration 5775 Morehouse Drive San Diego, CA 92121 US
- 代理机构： Wegner, Hans
- 优先权： US224382P 20090709; US610600 20091102
- 国际公布： WO2011006014 20110113
- 主分类号： H04B1/10
- IPC分类号： H04B1/10 ; H04B1/14 ; H04B1/38 ; H04B15/04
摘要：
A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.
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