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LT6230 cannot work well with a single power supply in LTspice.



		

			

									
					    ShawnTiger
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 23, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LT6230CS6 
    
    		        		        		        
    Software Version: LTspice VXII
    
    		    		    	
			
    Hi Team,
    

    I modified the LT6230 schematic in the LTspice tool, after that this circuit cannot work well.
    

    My modifications are below:
    

    1)change the two power supply +/-5V to 3V;
    

    2)set the offset of the sine signal to 1.5V;
    

     
    

    Note: V(n002)  is the output of the OP, the another one is the sine signal.
    

    would you please give me some hints? Thanks in advance.
    

    Br,
    

    ShawnTiger
    

    

    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Aug 31, 2022 6:42 AM
            
            
					
      
	
      

		
		
      
					
      Hi ShawnTiger,
      

      The LT6230 has an input range of 1.4 to 1.6V with a gain of 6 in a 3V supply, which explains why the circuit is not working after the modification. The input voltage is within the IVR based on the datasheet, however since there is a gain of 6 which would be multiplied to the input voltage then the output voltage would be beyond the 3V supply which is why the output is railing and that’s the reason why it would work on the +/- 5V. Modifying the supply or the gain could make the circuit work. 
      

       
      

      In order to assist you further, may I know what is more important in your application? Is it the supply or the gain?
      

      Regards and thanks,
      Mae
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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