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The ADRV9002 is a highly integrated RF transceiver that has dual-channel transmitters, dual-channel receivers, integrated synthesizers, and digital signal...
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ADRV9002 - RSSI with the RX used for DPD

		
	
				

			

									
					    nicolas_22
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 20, 2021 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hello AD experts,
    

    

    

    I use the FDD mode : TX1 and RX1B for the DPD. I would like to measure the emitted power with the RSSI from the RX1B.
    

    I use this script, It works fine for the RX2, but for RX1 it returns 0 :
    

    rxRssiStatus=adrv9001_RxRssiStatus_t()
    Adrv9001.rx.Rssi_Read(common_ChannelNumber_e.CHANNEL_1,rxRssiStatus)
    print "power_mdB:", rxRssiStatus.power_mdB
    print "linearPower_mantissa:", rxRssiStatus.linearPower_mantissa
    print "linearPower_exponent:", rxRssiStatus.linearPower_exponent
    

    Could you help us?
    

    Regards,
    

    Nicolas
    
			
    
			
									
		                             
                        

    
    
                                            
                 rssi
                
                                                    
                 ADRV9002
                
                                                    
                 Wideband Transceiver IC
                
                                                    
                 RF Integrated Transceivers
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 21, 2021 10:00 AM
            
            
						
			            		
      
		
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      Hi Nicolas_22,
      

      If we inspect this diagram from the User Guide:
       
      

      We see that the Rx DFE is mostly cut out from the system when DPD is used. This includes the RSSI block, meaning that when DPD is being executed on an ORx port, RSSI cannot be used via TES. In a manner of speaking the RSSI would be later in the Rx DFE than the DPD Coefficients Engine, meaning the Rx data is likely not even getting to that block.
      

      We are not certain if the RSSI API will even be allowed to run by the Firmware on an ORx, we will discuss with the SW team and return here, but to the best of our knowledge using an ORx port disallows the RSSI block.
      

      I hope this helps answer your questions! If you're comfortable with telling us more about your setup we can try find ways to better support your goals?
      

      Best Regards,
      Oisín.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Jul 21, 2021 11:27 AM
            
            
												
						in reply to ADIApproved
					
										
			            		
        
		
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        Hi Oisin,
        

        Thanks for your answer.
        

        We would like to measure the transmitted power as a built in test. The RX2 is already used, so the option would be to desactivate the DPD for measuring the output power?
        

        Regards,
        

        Nicolas
        

        

         
        

        

        

        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
						
                            
            
            				
            
                on Jul 22, 2021 3:45 AM
            
            
												
						in reply to nicolas_22
					
										
			            		
        
		
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        Hi Nicolas,
        

        If you wanted to measure output power using an External Loopback to Rx1 you would need to use the Rx1A port and use it just as a normal Rx, rather than an ORx, and deactivate DPD as you have described. You would also need to have adequate attenuation on that feedback path so as not to damage the Rx port.
        

        Best Regards,
        Oisín.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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