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ADTR1107 Recommended for New Designs
The ADTR1107 is a compact, 6 GHz to 18 GHz, front-end IC with an integrated power amplifier, low noise amplifier (LNA), and a reflective single-pole double...
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ADTR1107 on Analog.com

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ADTR1107 Power Droop

		
	
				

			

									
					    ua741
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 23, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is developing a system with multiple ADTR1107 FE ICs and is concerned about power droop on the +5V rail during TDD mode. The final answer suggests using a 4.7uF capacitor per ADTR1107 and pulsing the gate instead of the drain to manage the power supply, as seen in the ADAR1000EVAL1Z (STINGRAY) reference design. The accompanying answer confirms that gate pulsing reduces the delta I on the +5V rail, addressing the power droop issue.
                                    

                    

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Product Number:  ADTR1107  

    		        		    		    

		    		    
		    			

			    
Hello,


I'm currently developing a system that includes a number of ADTR1107 FE ICs all connected to the same voltage rails. Considering only the +5V rail that feeds the PAs and that one it's supposed to fully turn the PAs on and off in TDD mode I was doing some calculations to see if any extra bulk capacitance is needed for the system to work without significant power droop.


If I consider a max. droop of 5% of the VDD=5V, IDD=370mA and a PRF of 10kHz and D=1/3 I easily end up requiring hundreds of uF per each ADTR1107 which, given the tight space constraints, proves to be quite hard to position in the cell layout.


Do you have any suggestion regarding this topic?


BR,


G.

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 2, 2026 3:19 PM
            
            
						
			            		
    
		
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    I simulated the turn on behavior in LT Spice by switching in and out a 14 ohm load resistor (5V supply 350 mA of VDD current). I am not seeing massive droop on the VDD line. What we do see is that there is droop on the resistor voltage and current if you introduce source resistance to the power supply. Note that in the real application, if you are gate pulsing, there is not switch in the drain path. For the purposes of simulation, I have an ideal switch and a load resistor the mimic the resistance of the VDD pin changing as you take the gate voltage from pinch-off to drain turn on. 
    

    Eamon 
    

    

     
    

    ADTR1107 Turn On.asc
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
				
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 2, 2026 3:19 PM
            
            
						
			            		
    
		
										+1
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    I simulated the turn on behavior in LT Spice by switching in and out a 14 ohm load resistor (5V supply 350 mA of VDD current). I am not seeing massive droop on the VDD line. What we do see is that there is droop on the resistor voltage and current if you introduce source resistance to the power supply. Note that in the real application, if you are gate pulsing, there is not switch in the drain path. For the purposes of simulation, I have an ideal switch and a load resistor the mimic the resistance of the VDD pin changing as you take the gate voltage from pinch-off to drain turn on. 
    

    Eamon 
    

    

     
    

    ADTR1107 Turn On.asc
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
				
				
				
		
		
    
			
		
    
	
    

    

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