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HMC908 Obsolete
The HMC908LC5 is a compact GaAs MCM I/Q downconverter in a leadless RoHS compliant SMT ceramic package. This device provides a small signal conversion...
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HMC908 on Analog.com

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HMC908 EVB_Noise Floor



		

			

									
					    Kazu
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 9, 2015 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi Everyone,
    
 
    I have a problem with HMC908LC5 Evaluation Board. The noise floor value on the board
    
 
    suddenly increases from Pin=-30dBm as attached. Is it normal performance? I need to bring it
    
 
    down to -140 or -130 dBm. Do you know any method of improving this?
    
 
    Tawaraya
    
									
			        
		
    

				
							QuestionaboutHMC908NF.pdf
							
        

    
    Tags: 
                                            
                 I/Q Downconverters/Receivers
                
                                                    
                 RF Mixers
                
                                                    
                 HMC908
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 17, 2015 7:44 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      I apologize for the delay.
      
 
      Firstly, I'd like to point out that the HMC908LC5 is not recommended for new designs. If this is a new design please contact us and we'll work through searching an IQ mixer for your requirements.
      
 
      We did verify this measurement in the lab (I.e Noise Floor vs RFIN Level at 325 kHz). The noise floor increases as you get closer to the IF output (in this case DC) and decreases as you move away. So for this application the noise floor would be more at 100kHz and less at 700kHz.
      
 
      We are still trying to ascertain the reason for this increase in the noise floor as the RFIN power increases. I'll get back when we have more info.
      
 
      Thanks,
      
 
      Taz
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 17, 2015 7:44 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      I apologize for the delay.
      
 
      Firstly, I'd like to point out that the HMC908LC5 is not recommended for new designs. If this is a new design please contact us and we'll work through searching an IQ mixer for your requirements.
      
 
      We did verify this measurement in the lab (I.e Noise Floor vs RFIN Level at 325 kHz). The noise floor increases as you get closer to the IF output (in this case DC) and decreases as you move away. So for this application the noise floor would be more at 100kHz and less at 700kHz.
      
 
      We are still trying to ascertain the reason for this increase in the noise floor as the RFIN power increases. I'll get back when we have more info.
      
 
      Thanks,
      
 
      Taz
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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