ADRF5547 LNA : Measuring spur at LNA output on 4.4GHz frequency

Hi

We used ADRF5547 on our design. ADRF5547 integrated dual channel LNA. When we only turn on single LNA, the behavior is normally. But when we turn on dual channel LNA, we would measure  a spur at LNA output on 4.4GHz frequency without any signal input LNA. And this spur power ~ -67dBm. Is ADRF5547 have this spur when turn on dual channel LNA? If yes, how to resolved it?

Thanks

BR

Leo Kuo

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