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Misleading Spice model of ADA4096



		

			

									
					    jebaspaul
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 20, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    As per the information given in the datasheet the voltage noise density is 27nV/Sqrt(Hz).
    
 
    I have downloaded the spice model of ADA4096 and simulated as shown in attachment. The simulation results show that the voltage noise density is around 800nV/Sqrt(Hz).
    
 
    Please clarify.
    
 
    Thanks,
    
 
    Jebas.
    
								
    

							
    
				
				
			
    
					
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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                on Mar 21, 2014 10:47 AM
            
            
					
        
	
        

		
		
        
					
        Thanks Harry.
        
 
        I am using Simetrix.
        
 
        As you have pointed out, there is no relation between the input AC source amplitude and the noise measurement with respect to this simulator.
        
 
        Anyway, I have simulated as per your suggestion. PFA for the simulation setup and the output noise. Still the noise amplitude remains same in simulation.
        
 
        Jebas.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Mar 21, 2014 10:47 AM
            
            
					
          
	
          

		
		
          
					
          Thanks Harry.
          
 
          I am using Simetrix.
          
 
          As you have pointed out, there is no relation between the input AC source amplitude and the noise measurement with respect to this simulator.
          
 
          Anyway, I have simulated as per your suggestion. PFA for the simulation setup and the output noise. Still the noise amplitude remains same in simulation.
          
 
          Jebas.
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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