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AD8302 to be used as an RMS power detector



		

			

									
					    Vishnu
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 20, 2013 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    We are presently using AD8302 in our application for VSWR measurement.
    
 
    I would like to use the same for our PA ALC application, where I would use it for RMS power measurement. Is it possible to use this using the Vmag pin.
    
 
    Is yes, please tell me what I should do to the Vph pin (grounded or terminated to 50E...)
    
 
    Regards,
    Vishnu
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Apr 7, 2013 3:52 AM
            
            
					
      
	
      

		
		
      
					
      Hi, Vishnu,
      
 
          Are you trying to reuse the same AD8302 that you use for VSWR meas., to measure PA output power in the ALC loop also?  If you provide a known -30 dBm signal at one input, you can use the other input to measure ~ -60 to 0 dBm level.  Still, dedicated detectors are much cheaper than the 8302, and probably cost less space than to provide a -30 dBm reference and the switching needed to reuse the 8302.
      
 
      Benjamin
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Apr 7, 2013 3:52 AM
            
            
					
      
	
      

		
		
      
					
      Hi, Vishnu,
      
 
          Are you trying to reuse the same AD8302 that you use for VSWR meas., to measure PA output power in the ALC loop also?  If you provide a known -30 dBm signal at one input, you can use the other input to measure ~ -60 to 0 dBm level.  Still, dedicated detectors are much cheaper than the 8302, and probably cost less space than to provide a -30 dBm reference and the switching needed to reuse the 8302.
      
 
      Benjamin
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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