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how to design a dual-frequency receiver RF frontend?HELP!

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xinjimao

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Hello everybody,
i have the basic knowledge of designing a receiver RF frontend, and now i am trying to design a satellite receiver which can receive two frequencies at the same time.Commenly, this will be designed with two channels. i want to use the fewest components, for example only one LNA, PLL~
one signal is GPS, 1575.42MHz,another is about 20 MHz lower.


waiting for your advice :D
 

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