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ADL5304



		

			

									
						cecile
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Apr 29, 2022 
				
			
			
		


				
		

		    		    
		    
		    		            		        
Category: Hardware

    		        		        		    		    	
			
Hi, 


I need to use the ADL5304 to amplify the current of a photodiode.


I want to use the 200 dB range because I need to amplify very low light level.


I have a problem with Vlog, it is not linear between -90 and -66 dBm. I think this problem is due to the dark current of the photodiode but I can't find how to fix it.


Can you say how we can compensate the dark current of the photodiode using the evaluation board of ADL5304?

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	














	

	

					



			








	
	
	
	



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													+1
							
			
				
									
							        
            
                                                                                                        
      
                            
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                                 Analog Employees 
                                
                            
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                on May 2, 2022 5:57 PM
            
            
					
    
	
    

		
		
    
					
    Hi cecile,
    

    First may I suggest using oscilloscope to check the ADL5304 output, not just DVM. Often these types of problems are due to external AC noise sources finding their way into the high-Z PD connection node into the ADL5304. Also consider probing VNUM and VDEN nodes to make sure those nodes are relatively low noise also. 
    

    If noise is not a major contributor of error, the ADL5304 output should be quite accurate. Consider using the on-chip PD bias circuitry with IMON pin as a way to help reduce PD dark leakage. For some rather unique applications, the on-chip PD bias circuitry may not be good enough and a more specialized custom PD bias circuit could be necessary. 
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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													+1
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on May 2, 2022 5:57 PM
            
            
					
    
	
    

		
		
    
					
    Hi cecile,
    

    First may I suggest using oscilloscope to check the ADL5304 output, not just DVM. Often these types of problems are due to external AC noise sources finding their way into the high-Z PD connection node into the ADL5304. Also consider probing VNUM and VDEN nodes to make sure those nodes are relatively low noise also. 
    

    If noise is not a major contributor of error, the ADL5304 output should be quite accurate. Consider using the on-chip PD bias circuitry with IMON pin as a way to help reduce PD dark leakage. For some rather unique applications, the on-chip PD bias circuitry may not be good enough and a more specialized custom PD bias circuit could be necessary. 
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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