发明授权
US06192228B1 Method and apparatus for improving the sensitivity of an RF receiver at certain frequencies
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用于提高RF接收机在某些频率下的灵敏度的方法和装置
- 专利标题： Method and apparatus for improving the sensitivity of an RF receiver at certain frequencies
- 专利标题（中）： 用于提高RF接收机在某些频率下的灵敏度的方法和装置
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申请号： US09153008申请日： 1998-09-11
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公开(公告)号： US06192228B1公开(公告)日： 2001-02-20
- 发明人: Darioush Agahi-Kesheh , William J. Domino , Mark Oskowsky , Dmitriy Rozenblit
- 申请人： Darioush Agahi-Kesheh , William J. Domino , Mark Oskowsky , Dmitriy Rozenblit
- 主分类号： H04Q732
- IPC分类号： H04Q732
摘要：
A method and apparatus for improving the sensitivity of a radio frequency (RF) receiver at certain frequencies suffering from co-channel interference. In the preferred embodiment, when a reference frequency, FREF, generates significant harmonics for a received RF signal in a selected channel, the reference frequency is varied or offset by a small amount, &Dgr;F. The harmonics of the offset reference frequency, F′REF=FREF±&Dgr;F, are thereby shifted away from the frequency of the received RF signal, thus reducing co-channel interference. The offset amount &Dgr;F is chosen such that the same injection frequency synthesized from FREF can still be synthesized from FREF±&Dgr;F by shifting N by an integer amount, preferably to N+1 or N−1. However, the invention encompasses shifting N by other integer amounts.
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