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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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    •  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
					
									
    
	
    

		
		
    
					
    If you know Pin, actually you can calculate IIP3. But in this case you're right, because the power used in the calculation is Pout (the only power known) so the calculated IP3 is OIP3. I will need to correct my answer. 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
			                            
                                                                                                                        
            
				
			
            
												
						in reply to hunl
					
									
    
	
    

		
		
    
					
    If you know Pin, actually you can calculate IIP3. But in this case you're right, because the power used in the calculation is Pout (the only power known) so the calculated IP3 is OIP3. I will need to correct my answer. 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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