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ADAR2004 Recommended for New Designs
The ADAR2004 is a 4-channel receiver IC that is optimized for millimeter wave body scanning applications. Accepting differential input signals from 10...
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ADAR2004 on Analog.com

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Peak-to-Peak Output Voltage Swing

		
	
				

			

									
					    DimitarPartenov
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 14, 2024 
				
			
			
		
    
		
		                    	    
    
        	    
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                The user is confused about the peak-to-peak output voltage swing of the ADAR2004 at P1dB. The final answer suggests that the values in the datasheet might be reversed, with 1.125Vpp at minimum gain (21 dB) and 0.632Vpp at maximum gain (41 dB). The engineer will verify this using an ADAR2004 eval board in the lab.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  ADAR2004  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello All,
    

    How is calculated or measure the peak-to-peak output voltage swing of ADAR2004? In the datasheet at the P1dB minimum gate, the swing voltage is 1.25 V. The input power is -20 dBm and the gain is 21 dB. The output power then is 1 dBm which corresponds to 1 V swing over 100 Ohms output impedance. I am confused why in the datasheet the swing voltage is measured at 1.25 V. A Similar situation is when we have maximum gain. 
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jun 17, 2024 10:48 AM
            
            
						
			            		
      
		
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      I think that the numbers for Peak to Peak Output Voltage Swing (1.125Vpp and 0.632Vpp for min and max gain respectively), may be reversed in the datasheet. The datasheet says that at min gain (21 dB), IP1dB is -20 dBm. So if you apply -20 dBm, Pout should be 0 dBm (gain is reduced by 1 dB at compression). 0 dBm in a 100 ohm system is 0.894 Vpp.
      

      At max gain (41 dB), IP1dB is -36 dBm. So if you apply -36 dBm, pout should be +4 dBm which is 142 Vpp. These pp voltage numbers do not match exactly with the numbers in the datasheet but it does appear that the output voltage swing should be higher  when the gain is at is maximum. 
      

      I'm travelling at the moment. When I get back to the office, I'll set up an ADAR2004 eval board in the lab and will check this. - Eamon
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
				
				
				
		
		
      
			
		
      
	
      

      

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