发明授权
- 专利标题： Variable digital very low intermediate frequency receiver system
- 专利标题（中）： 可变数字非常低的中频接收机系统
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申请号： US11740036申请日： 2007-04-25
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公开(公告)号： US08102943B1公开(公告)日： 2012-01-24
- 发明人: Nadim Khlat , Alexander Wayne Hietala
- 申请人： Nadim Khlat , Alexander Wayne Hietala
- 申请人地址： US NC Greensboro
- 专利权人： RF Micro Devices, Inc.
- 当前专利权人： RF Micro Devices, Inc.
- 当前专利权人地址： US NC Greensboro
- 代理机构： Withrow & Terranova, P.L.L.C.
- 主分类号： H04L27/00
- IPC分类号： H04L27/00 ; H03K9/00
摘要：
The present invention is a radio frequency (RF) receiver that uses an RF mixer for tuning to desired frequency bands. The RF receiver down converts a received RF signal into a very low intermediate frequency (VLIF) signal. When receiving a desired RF signal, the frequency of the resulting VLIF signal is called the desired VLIF frequency, and is based on the signal strength of the received RF signal. In one embodiment of the present invention, the desired VLIF frequency is selected to be one of two VLIF frequencies, and is inversely related to the signal strength of the received RF signal. For example, a higher desired VLIF frequency is selected when receiving lower signal strength RF signals to increase effective receiver sensitivity. A lower desired VLIF frequency is selected when receiving higher signal strength RF signals to improve image rejection.
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