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ADRV9002 Recommended for New Designs
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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AGC Threshold Level

		
	
				

			

									
					    Sleepy2025
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 29, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about AGC parameters, specifically if the ADP threshold levels of -27 dBFS (overload) and -30 dBFS (underload) are too low, causing the Rx Gain Index to stick at its minimum. The final answer advised increasing the gap between thresholds to -15 dBFS (overload) and -40 dBFS (underload) to improve detection reliability and avoid the stuck gain issue. Additionally, setting `lowThreshPreventGainInc = false` is recommended to allow gain increases with low input levels. A known issue with the AGC was mentioned, and the user was directed to a relevant thread for more details.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  ADRV9002  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Dear Specialists,
    

    I have a question regarding the AGC parameters.
    Regarding the ADP threshold levels, are the following values too low?
    

    Peak Overload Threshold = -27 dBFS
    Peak Underload Threshold = -30 dBFS
    

    When there is no RF input, the Rx Gain Index sticks at its minimum.
    I want to keep the LSSI output amplitude relatively low, so I'm trying to activate the AGC with a lower RF input level.
    Could you offer any advice?
    

    Regards,
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 29, 2025 6:22 AM
            
            
						
			            		
      
		
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      HI  
      

      The selected thresholds of –27 dBFS (overload) and –30 dBFS (underload) are indeed quite close together. The AGC’s Peak Detector logic struggles with such narrow margins, especially since it relies on consistent peak measurements. Increase the gap between thresholds to improve detection reliability—e.g., –15 dBFS (overload) and –40 dBFS (underload). This gives the AGC more dynamic range for decision-making and avoids the “stuck at minimum gain” issue.
      

      

      Setting lowThreshPreventGainInc = false is essential to allow gain increases when input is low.
      

      

      Regards,
      

      SJ
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Oct 29, 2025 7:11 AM
            
            
												
						in reply to SJagini
					
										
			            		
        
		
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        Hello SJ,
        

        Thank you for your prompt answer.
        

        I' ll try it soon.
        

        Regards,
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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