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ADXRS620 Questions



		

			

									
					    autelLeo
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 8, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi, I just get another three question about the ADXRS620:
    
 
    1. Based on the figure1  in the data sheet, may I conclude the drive axis utilize the trans-impedence circuit while the sense axis employ the charge amplifier circuit to sense the variation of the weak capacitive signal ?
    
 
    2. How to understand the unexpected frequency signal around 4kHz in the figure21 (page 8, the noise spectral density) ?
    
 
    3. If I want to set the circuit gain and bandwidth of the last stage by placing a resistant between the SUMJ and Rateout, what's the type of the circuit, it is inverting amplifier or noninverting amplifier, I guess it should be inverting amplifier, but the functional block diagram confuse me. 
    
 
    thanks
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Jul 8, 2016 9:12 PM
            
            
					
      
	
      

		
		
      
					
      QUESTION
      
 
      3. If I want to set the circuit gain and bandwidth of the last stage by placing a resistant between the SUMJ and Rateout, what's the type of the circuit, it is inverting amplifier or noninverting amplifier, I guess it should be inverting amplifier, but the functional block diagram confuse me. 
      
 
      thanks
      
 
      RESPONSE
      
 
      I can see how this might create some confusion. Unfortunately, the original author of this datasheet is not with our company anymore, so we don't have any opportunity to ask for clarification on this. However, I can assure you that the section in the datasheet, which explains how to establish the bandwidth, is correct. 
      
 
      Great questions! Sorry I am not able to help more, but I hope that this is sufficient for helping you move forward.
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Jul 8, 2016 9:12 PM
            
            
					
      
	
      

		
		
      
					
      QUESTION
      
 
      3. If I want to set the circuit gain and bandwidth of the last stage by placing a resistant between the SUMJ and Rateout, what's the type of the circuit, it is inverting amplifier or noninverting amplifier, I guess it should be inverting amplifier, but the functional block diagram confuse me. 
      
 
      thanks
      
 
      RESPONSE
      
 
      I can see how this might create some confusion. Unfortunately, the original author of this datasheet is not with our company anymore, so we don't have any opportunity to ask for clarification on this. However, I can assure you that the section in the datasheet, which explains how to establish the bandwidth, is correct. 
      
 
      Great questions! Sorry I am not able to help more, but I hope that this is sufficient for helping you move forward.
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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