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HMC920 Recommended for New Designs
HMC920LP5E is an active bias controller which generates a regulated Drain voltage and actively adjusts the gate voltage of an external amplifier to achieve...
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HMC920 on Analog.com

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Does it make sense to design a closed loop circuit for bias control of a 28V or 50V GaN amplifier?

		
	
				

			

									
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  •  Analog Employees  

			
			
			    	
			                    
                
				                on Feb 8, 2023 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		            		    
Product Number:   HMC980, HMC981, HMC920 

    		        		    		    

		    		    
		    			

			    
Does it make sense to design a closed loop circuit for bias control of a 28V or 50V GaN amplifier?

			

			
									
		                             
                        

    

                                            
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                 Optimizing GaN and GaAs RF Amplifier Performance Using Novel Biasing Techniques
                
                                                    
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Feb 8, 2023 5:36 AM
            
            
						
			            		
    
		
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    You could do this but we have not covered it in this webinar. Most of the ADI's GaN amplifiers are designed for use in radar application where the amplifier must be turned on and off very quickly, typically in the sub 1us range. It's not really practical to design a closed loop circuit with negative feedback which can switch on an off at that speed.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Feb 8, 2023 5:36 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    You could do this but we have not covered it in this webinar. Most of the ADI's GaN amplifiers are designed for use in radar application where the amplifier must be turned on and off very quickly, typically in the sub 1us range. It's not really practical to design a closed loop circuit with negative feedback which can switch on an off at that speed.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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