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Questions while reading the specification of ADA4530-1 .



		

			

									
					    RobertLiang
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 30, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    

    Because of the lack of my experience, I have faced a question while reading the datasheet. After a lot of searching, I still have no idea. Thanks in advance for your guidance.
    

    The question is about the picture below.
    

     
    

    The open-loop gain and phase margin depend on the capacitance to a certain degree, however, there's no description of the capacitance. I wonder if it's the feedback capacitor to improve the stability because it's a small one?
    

    So I established the simulation in Multisim 14 using the SPICE model which I downloaded on the official website, and the circuit to verify the open-loop feature is as below:
    

     
    

    And the AC sweep result is:
    

     
    

    

    ---
    

    

    So why the result from my simulation is different a lot from the datasheet? Is there any error in my circuit? 
    

    Thanks again.