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HMC966 Recommended for New Designs
The HMC966LP4E is a compact GaAs MMIC I/Q downconverter in a leadless RoHS compliant SM T package. This device provides a small signal conversion gain...
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HMC966 on Analog.com

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HMC966LP4E Image Rejection



		

			

									
					    sss
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 23, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi all,
    
 
    Our customer evaluate the HMC966 RF performances.
    
 
    Frequency is ,
    
 
    ・LO=10GHz , +6.5dBm
    
 
    ・RF=18GHz
    
 
    ・IF=700MHz
    
 
    Following the measurement setting is Typical Application Circuit at the datasheet 12 page.
    
 
    SG(RF) - isolator - HMC966 - 90 deg Hyblid(IF) - filter - Spectrum Analyzer
    
 
    SG(LO) - isolator - 
    
 
    Our customer measurement data of Image rejection is the data sheet specifications as well as the 15dB, but it is minimum spec.
    
 
    Customer target spec is 20dB(min) w / design margin.
    
 
    What we are thinking that , 
    
 
    Is it possible to improve the performance by adjusting the line length between the IF1/IF2 output and the 90 deg Hyblid ?
    
 
    Do we have other way to improve the performance of the Image rejection ?
    
 
    Best regards,
    
 
    sss
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Jun 27, 2016 6:27 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      Could you please double check the RF,LO,IF frequency? I think there are some errors in the frequency.
      
 
      Thanks,
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Jun 28, 2016 6:25 PM
            
            
					
        
	
        

		
		
        
					
        Hi huangzeyan - san,
        
 
        Sorry for the missing freq information.
        
 
        Frequency is ,
        
 
        ・LO=10GHz , +6.5dBm >>> 16.99~18.99GHz(8.495~9.495GHz x2)
        
 
        ・RF=18GHz >>> 17.7～19.7GHｚ
        
 
        ・IF=700MHz >>> 710MHz
        
 
        Best regards,
        
 
        sss
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
			                            
                        
                on Jul 1, 2016 1:30 AM
            
            
					
        
	
        

		
		
        
					
        Hi,
        
 
        We measured the conditions at LO=18G and the image rejection is about 25dBc.
        
 
        I think the low image rejection may come from the filter they had before the SA. To verify the mixer performance, it is recommended to measure the IF signal without the filter, connected to the SA directly or using a IQ analyzer without hybrid. If the result is better than with the filter, you may need to redesign the filter.
        
 
        Otherwise, adjust the path length is an option. What needs to be careful is that the parts vary from each other. Every part may have different path length adjustment. And one solution might only work for one fixed operating frequency.
        
 
        Thanks,
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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