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HMC346 Obsolete
The HMC346 devices are absorptive, voltage variable attenuators (VVAs) operating from dc to 8 GHz, 14 GHz, 18 GHz, or 20 GHz. They feature on-chip reference...
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HMC346 on Analog.com

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HMC346 for positive control voltage operation

		
	
				

			

									
					    gwongLL
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 31, 2022 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Dear ADI support,
    

      Can the HMC346AMS8G switch be used with 0/+5V control voltage by connecting the ground paddle and ground pins to +VDD and DC blocking the RF input / output pins?
    

    If so, is there any anticipated problem with RF performance aspects such as return loss, distortion or insertion loss / isolation?
    

    Any precautions when doing this? Thank you,
    

    Jerry
    
			
    
			
									
		                             
                        

    
    
                                            
                 Voltage Variable Attenuators
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Aug 31, 2022 5:03 AM
            
            
						
			            		
      
		
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      Hi Jerry,
      

      

      It is possible in theory but supply shifting is not tried/demonstrated for this particular part. What is you RF frequency?
      

      Please note that you should increase all pin voltages. RF pins were initially at 0V, thus they will also be shifted by 5V for example and they would require a DC block. Likewise, the driver opamp needs to be shifted as well...
      

      You would require additional bypass capacitors from GND pins of HMC346A to PCB's RF ground to provide good AC Ground to those pins.
      

      

      Thanks
      

      Sinan 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
				
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Aug 31, 2022 5:03 AM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi Jerry,
      

      

      It is possible in theory but supply shifting is not tried/demonstrated for this particular part. What is you RF frequency?
      

      Please note that you should increase all pin voltages. RF pins were initially at 0V, thus they will also be shifted by 5V for example and they would require a DC block. Likewise, the driver opamp needs to be shifted as well...
      

      You would require additional bypass capacitors from GND pins of HMC346A to PCB's RF ground to provide good AC Ground to those pins.
      

      

      Thanks
      

      Sinan 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
				
				
				
		
		
      
			
		
      
	
      

      

      • 


    


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