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KCC's Quizzes: AQQ229 about IP3 lab measurement



		

			

									
					    KCC
					
							

			
				
									
											
			
			
				
  •  Analog Employees  

			
			
			    	
			                    
                
				                on Mar 2, 2023 
				
			
			
		


				
		

		    		    
		    
		    	
			
   


IP3 (intercept point of order 3) is a spec one find in many RF component datasheet. It is directly linked with the linearity of a function behavior. 


More precisely, It indicates the amount of the intermodulation products of order 3 that interfere with the baseband.


The above pictures show the lab setup and a Spectrum Analyzer screenshot to measure the IP3 of a device (DUT) in the lab.


Questions:


    

  1. What are the frequencies provided by sources 1 and 2?
    2. 

  2. What is the IP3 measured in that test?
    3. 


										


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[edited by: emassa at 5:46 PM (GMT -5) on 2 Mar 2023]
				

						
			        
		


				
						
        

    
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                 KCC's Quizzes
                
                                                    
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    •  Analog Employees  
    
            
			                            
                                                                                                                        
            
				
			
            
					
    
	
    

		
		
    
					
    1) Fundamental Freqs    f1= 1245 MHz, f2= 1255MHz
    

    2f1-f2= 1235 MHz,  2f2-f1= 1265 MHz 
    

    

    2) Delta -11dBm - (-45dBm) = 34dB = 2*(OIP3 - Pout) = 2 ( OIP3 - (-11dB) ) -- > OIP3 = 6dBm
    

    

    

    I believe this was a 7dB Gain device (forgotten to be mentioned in the text :-) )  Then IIP3= 6-7 = -1dBm 
    

    

       you find OIP3, not IIP3. Without OP-Gain info, we cant calculate IIP3 ;-)  
    


    Edit: Added IM3 Frequencies 2f2-f1 and 2f1-f2 Frequencies. 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
			                            
                                                                                                                        
            
				
			
            
												
						in reply to hunl
					
									
    
	
    

		
		
    
					
    Thanks Hakan for your answers and your remark about OIP3! Without telling too much detail here, I can say "big applause"! 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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