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LVTTL to NIM Translator with AD8009



		

			

									
					    DennisCazar
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 11, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I´m designing a LVCMOS to NIM signal translator, requirements of the circuit are
    

    Input frequency from 10KHz to 40Mhz
    

    Input 3.3V LVCMOS
    

    Output  logic "0" 0mA  or 0V; logic  "1" 18mA or 1V
    

    I decide to use AD8009 because it declares a 5500V/us slew rate but during simulations I found a delay of approx 1ns and some signal distortion, I´d like to have a delay between input and output as little as possible ( 100ps or less)
    

    How can I improve the response?
    

    In simulation green is input, red is output current and blue voltage current
    

    Thanks for your help
    

     
    

     
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Feb 12, 2020 6:41 AM
            
            
					
      
	
      

		
		
      
					
      Hello,
      

      I do agree with KirV that what you seen is an overshoot.
      

      

      I have tried your circuit only that I have reduced the resistor values by factor of 4.
      

      I only retain the two 100 ohms and the 50 ohms near the output.
      

      I were able to reduce the propagation delay from ~600pS to ~190pS.
      

       
      

      

      Also, I have tried to simplify your circuit.
      

      The 1st stage is inverter/attenuator and the 2nd stage is inverter/buffer.
      

      I used divider instead and feed into the buffer.
      

      I were able to obtain ~135pS prop delay.
      

       
      

      Hope this helps.
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Feb 12, 2020 3:01 PM
            
            
												
						in reply to Fdelaram
					
									
        
	
        

		
		
        
					
        Dear Fdelaram
        

        

        Thank you so much for your help, the improvement in delay is huge and that´s wath worried me the most!
        

        

        Best regards
        

        

        Dennis
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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