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Blocking test failed, where and how to improve it?

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dd2001

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in GSM, out of channel, blocking test was failed, how and where to start improve it? Any one give a direction?

LNA, Filter?
 

First places that you have to check is the IP3 of the LNA, the rejection of the RX SAW filter (out-of-band blocking), and the phase noise of the LO.
regards
 

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