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ADRF5547 Recommended for New Designs
The ADRF5547 is a dual-channel, integrated RF, front end multichip module designed for time division duplexing (TDD) applications that operates from 3...
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ADRF5547 on Analog.com

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

		
	
				

			

									
					    Leo Kuo
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 28, 2021 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user observed a spur at 4.4 GHz (~-67 dBm) on the ADRF5547 LNA output when both channels are enabled, but not when a single channel is active. The final answer suggests checking the power supply type, ensuring adequate via placement on the exposed paddle, and measuring supply currents in different modes. Additional recommendations include verifying the presence of 10 uF capacitors for LNA supplies, 100 pF capacitors for PD, BP, and SWCTRL pins, and ensuring 50 ohm loads at inputs and outputs.
                        	    
    
                
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    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
    
			
    
			
									
		                             
                        

    
    
                                            
                 Massive MIMO Receiver Front-Ends ICs
                
                                                    
                 ADRF5547
                
                                                    
                 RF Front-End ICs
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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