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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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                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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