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ADRV9009 Recommended for New Designs
The ADRV9009 is a highly integrated, radio frequency (RF), agile transceiver offering dual transmitters and receivers, integrated synthesizers, and digital...
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ADRV9009 on Analog.com

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Attenuation lo leakage

		
	
				

			

									
					    RfCheck
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 13, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		        		    		    
    
		    		    
		    			
    
			    
    Hi,
    

    I've been experiencing an issue on adrv9009 with zcu102.
    

    The problem involves LO leakage when adjusting the TX attenuation.
    

    I'm operating at an LO frequency of 900 MHz. Initially, with a 10 dB attenuation setting, the LO leakage measured -74 dBm. After increasing the attenuation to 27 dB and recalibrating, the LO leakage increased to -65 dBm.
    

    I've attached images showing the issue. Could you please help me understand why this is happening and how to address it?
    

    This issue was happening on 2400MHz as well.
    

    I wanted to ask if you can show me the scheme where the attenuation placed before the mixer or after?
    

    

    10dB attenuation => lo leakage on 900MHz = -74dBm
    

     
    

    

    

    

    27dB attenuation 900MHz lo leakage = -65dBm 
    

     
    

    

    
			
    
			
									
		                                 
    Thread Notes  
    
                
    
        
                                        
                        

    
    
                                            
                 hardware
                
                                                    
                 lo leakage
                
                                                    
                 attenuation
                
                                                    
                 adrv9009
                
                                                    
                 Wideband Transceiver IC
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 14, 2025 1:51 AM
            
            
						
			            		
      
		
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      Are you using eval or custom board?
      

      Can you please check and confirm if TX to ORX is connected in the setup ?
      

      Are you running the TX LOL tracking cal?
      

      Initially can you please keep the chip at one particular attenuation level say 10db attenuation and measure the LO leakage. Check the TxLolStatus() and see if iter and update count are incrementing without any ErrorCode? 
      

      Below is the recommended LO leakage at 0dB attenuation from the datasheet.
      

       
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Nov 16, 2025 6:27 AM
            
            
												
						in reply to vanitha
					
										
			            		
        
		
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        Hello,
        

        I am working with a ZCU102 + ADRV9009 evaluation board,
        

        

        I am connected from Tx1 to ORX1, using a splitter to both the spectrum analyzer and the ORX1 channel.
        

        

        

        After running the Tx LOL tracking calibration, the leakage improves from about –65 dBm to –74 dBm. However, I notice that I need to repeat the calibration every time I change the attenuation.
        

        

        

        I am working with a ZCU102 + ADRV9009 evaluation board, but I haven’t found an option to check the Tx LOL calibration status. Could you please tell me which register or API function can be used to read this status from the UART terminal?
        

        

        

        Also, I would like clarification on the signal chain: is the attenuation applied before the mixer or after the mixer? If possible, could you provide a simple block diagram showing where the attenuation is placed?
        

        Thank you.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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