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HMC908A Recommended for New Designs
The HMC908A is a compact, gallium arsenide (GaAs), monolithic microwave integrated circuit (MMIC), inphase/quadrature (I/Q) downconverter in a leadless...
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HMC908A on Analog.com

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HMC908A IQ Demodulator

		
	
				

			

									
					    Yumna
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 2, 2021 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hi, 
    


    I am using HMC908A IQ Demodulator evaluation board EV1HMC908ALC5. It worked perfectly fine for two days (as I found phase imbalance at various LO power levels successfully) but on the third day when I connected VDD1 & VDD2 at 3.3V @ 65mA, VDD3 at 5V @ 80mA & GND pins and powered it up VDD3 is drawing more current with no load and showing short circuit. Previously current dissipation was less than 1mA on VDD3 during tests with no load.Please tell me what's just happened?
    

    

    Regards,
    Yumna
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Mar 4, 2021 10:31 AM
            
            
						
			            		
      
		
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      Hi Yumna,
      

      Its difficult to debug without more information but from your description it sounds like there was ESD damage on one of the pins-> very likely the VDD3 pin. Note the ESD HBM voltage for the HMC908A is rated at 250V so its particularly sensitive to ESD damage and proper ESD precautions need to be followed when handling the device.
      

      Thanks,
      

      Taz
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
				
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Mar 4, 2021 10:31 AM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi Yumna,
      

      Its difficult to debug without more information but from your description it sounds like there was ESD damage on one of the pins-> very likely the VDD3 pin. Note the ESD HBM voltage for the HMC908A is rated at 250V so its particularly sensitive to ESD damage and proper ESD precautions need to be followed when handling the device.
      

      Thanks,
      

      Taz
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
				
				
				
		
		
      
			
		
      
	
      

      

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