Products Mentioned

HMC993 Obsolete
The HMC993LP5E is an RF analog controlled variable gain amplifier composed of two identical voltage variable attenuators in combination with an InGaP HBT...
Datasheet
HMC993 on Analog.com

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HMC993 replacement part for AGC circuit



		

			

									
					    vincenthalde
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 16, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi there,
    
 
    I am working on a design where I need to output a 3GHz sine wave with a constant amplitude (Automatic Gain control / AGC). The HMC993 would have been perfect (VGA with integrated log power detector), but is now obsolete and has no replacement part. 
    
 
    It seems now that there are less analog AGC circuits and more of the Variables Gain Amplifier (VGA) are turning to Digital Variable Gain Amplifier (DVGA). Am-I right, and isn't it a little bit more cumbersome to use multiples parts instead of, for exemple, the HMC993? Maybe there is a simple circuit that I haven't understood, any help would be appreciated.
    
 
    Vincent
    
									
			        
		
    

				
						
        

    
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                 hmc993
                
                                                    
                 agc
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Feb 12, 2019 4:04 PM
            
            
					
      
	
      

		
		
      
					
      Hi Vincent,
      

      Thanks for your inquiry.  We have other VGA and Detector products that may work for your application.  A couple of analog devices that may apply are:  ADL5330 analog VGA and a log detector, AD8318 .  Details are available on Analog.com.  See also app note AN-1507:  Stable, Closed-Loop, Automatic Power Control for RF Applications; available on the ADL5330 product page.
      

      Thanks,
      

      Darrell  
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Feb 12, 2019 4:04 PM
            
            
					
      
	
      

		
		
      
					
      Hi Vincent,
      

      Thanks for your inquiry.  We have other VGA and Detector products that may work for your application.  A couple of analog devices that may apply are:  ADL5330 analog VGA and a log detector, AD8318 .  Details are available on Analog.com.  See also app note AN-1507:  Stable, Closed-Loop, Automatic Power Control for RF Applications; available on the ADL5330 product page.
      

      Thanks,
      

      Darrell  
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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