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HMC561LP3 Production
The HMC561LP3(E) is a x2 active broadband frequency multiplier utilizing GaAs PHEMT technology in a leadless RoHS compliant SMT package. When driven by...
Datasheet
HMC561LP3 on Analog.com

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About HMC561LP3 Biasing Circuit design

		
	
				

			

									
					    applo168
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 5, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  HMC561LP3 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi, ADI team:
    

    I'm planning to use the HMC561LP3 to design a frequency multiplication circuit.
    

    When designing the bias circuit, I carefully read the document linked below and found two options for VDD/VGG biasing.
    

    I'm currently leaning towards Figure 2: Fixed gate voltage biasing.
    

    https://www.analog.com/media/en/analog-dialogue/volume-57/number-4/active-biasing-solution-for-phemt-power-amps.pdf
    

    I have some questions about fixed gate voltage biasing:
    1. What are the effects of not using the HMC561LP at the optimal bias point? Is it okay to just use the datasheet's Vgg = -1.7V, Vdd = 5V?
    2. Does the optimal bias point vary significantly between different HMC561LP3s?
    

    Thanks.
    

    

    

    
			
    
			
									
		                             
                        

    
    
                                            
                 frequency dividers
                
                                                    
                 and Detectors
                
                                                    
                 hardware
                
                                                    
                 hmc561lp3
                
                                                    
                 multipliers
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Sep 8, 2025 9:15 AM
            
            
						
			            		
      
		
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      Hello Applo168,
      

      

      To answer you inquiry on HMC561LP3, 
      

      1. operating the device outside spec will affect the device performance. It is always best to use specified VDD and VGG levels (current levels) in the DS. 
      

      2. It may vary form part to part, but as suggested in the DS, you may adjust the VGG levels from -2V to -1.2V to achieve an IDD of 98mA.
      

      

      Kind Regards,
      

      Michelle
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
				
				
				
		
		
      
			
		
      
	
      

      

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