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ADPD 410x TIA gain weird behavior



		

			

									
					    Genadi
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 16, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Software
    
    		        		            		    
    Product Number:  ADPD410x  
    
    		        		    		    	
			
    Hello.
    

    Could you please explain to me why when the output of one of the timeslots is saturated and I increase the gain resistance, the output drops? This occurs even with a single pulse configuration.
    

    Sincerely, Gennady.
    
										

    
				Moved & added product number tag.
    
[edited by: emassa at 6:24 PM (GMT -5) on 16 Jan 2023]
				
    
					
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Feb 9, 2023 12:53 PM
            
            
					
        
	
        

		
		
        
					
        Hi!
        

        Do you use the analog integration mode with +/- math operations to subtract the dark signal after the pulses?
        I just had similar readouts recently. My guess is your ADC is already saturated with the LED pulses but the ambient light is low. But when you increase the gain, the more amplified ambient light  can significantly reduce the signal at the end.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Feb 9, 2023 12:53 PM
            
            
					
          
	
          

		
		
          
					
          Hi!
          

          Do you use the analog integration mode with +/- math operations to subtract the dark signal after the pulses?
          I just had similar readouts recently. My guess is your ADC is already saturated with the LED pulses but the ambient light is low. But when you increase the gain, the more amplified ambient light  can significantly reduce the signal at the end.
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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