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AD9051 Production
The AD9051 is a complete 10-bit monolithic sampling analog-to- digital converter (ADC) with an onboard track-and-hold and reference. The unit is designed...
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AD9631 Production
The AD9631/AD9632 are very high speed and wide bandwidth amplifiers. The AD9631 is unity gain stable. The AD9632 is stable at gains of 2 or greater. Using...
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AD9631 on Analog.com

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ADC (AD9051)Front end design

		
	
				

			

									
					    Shamanth.s
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Aug 8, 2016 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
Hello , 

 
I use  log detector (like AD8318)  for pulse detection application. Applying detector output to ADC and which is sampled at 20MSPS and use this samples for further processing.

 
I use ADC part AD9051 in single ended ,DC coupled mode as shown below.

 

 
Problem here is output of AD9631 is inverted compared to Vin   (with DC shift )and hence I need  to  use one more inverting amp to make ADC input   compatible with Vin.

 
Please suggest simple solution for problem?

 
Thanks /

 
Shamanth

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Aug 9, 2016 7:56 PM
            
            
						
			            		
    
		
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    Hi Shamanth,
    
 
    I discussed your inquiry with the AD9631 support team and the general consensus is that in order to maintain polarity unity with your system input you will either need to invert your signal with an additional unity gain amplifier stage before it goes into the AD9361, or digitally invert the output polarity post-conversion from the ADC within your receiver logic/FPGA.
    
 
    Best Regards,
    
 
    TonyM
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Aug 9, 2016 7:56 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi Shamanth,
    
 
    I discussed your inquiry with the AD9631 support team and the general consensus is that in order to maintain polarity unity with your system input you will either need to invert your signal with an additional unity gain amplifier stage before it goes into the AD9361, or digitally invert the output polarity post-conversion from the ADC within your receiver logic/FPGA.
    
 
    Best Regards,
    
 
    TonyM
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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