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lock-in amplifier using AD630 or ADA2200.



		

			

									
					    thomasnappez
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 25, 2017 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    I want to built a lock-in amplifier with a LO frequency below 5kHz. I am little confused about the choice between AD630 and ADA2200. The performance is the main concern in my application (not the power consumption nor the price). How can I choose the best part: what are the main specifications to look at? And what would be better as a preamplifier: a low noise transimpedance amplifier (such as AD8067, ...) or an input amplifier (such as ADA8429, ...)?
    
 
    Thank you very much for your answer.
    
 
    Thomas
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Dec 2, 2019 2:00 PM
            
            
					
      
	
      

		
		
      
					
      Hello Thomas,
      

      There is a third option that may provide the best performance.  That is the LTC6943. If you look on page 10, there is a schematic for a lock-in amplifier.  This circuit may perform the other 2.  It is hard to say.  One key metric of performance for a lock-in amplifier is the integrated noise over its output bandwidth.  But there are other metrics.  They need to be considered in the context of the application.
      

      Brian
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Dec 2, 2019 2:00 PM
            
            
					
      
	
      

		
		
      
					
      Hello Thomas,
      

      There is a third option that may provide the best performance.  That is the LTC6943. If you look on page 10, there is a schematic for a lock-in amplifier.  This circuit may perform the other 2.  It is hard to say.  One key metric of performance for a lock-in amplifier is the integrated noise over its output bandwidth.  But there are other metrics.  They need to be considered in the context of the application.
      

      Brian
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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