SLA Information

SLA Status Assignee Support Status
SLA Closed. Open
 
Activating this link will open 2 new browser tabs.

Products Mentioned

ADL5513 Recommended for New Designs
The ADL5513 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs...
Datasheet
ADL5513 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 3 replies
  • Subscribers 69 subscribers
  • Views 2571 views
  • Users 0 members are here 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
ADL5513 noise <1kHz

		
	
				

			

									
					    mtwieg
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jul 27, 2020 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is seeking data on the ADL5513's output noise density below 1kHz for a detector with an envelope bandwidth of 0-100Hz. The final answer suggests that the 1/f noise in the graphs may be influenced by the test setup, and the user measures a standard deviation of 0.002dB (42uV rms) at 100Hz, with a noise density of 4.2uVrms/sqrt(Hz). The user notes that increasing the acquisition bandwidth to 1kHz does not significantly increase the rms noise, indicating low-frequency noise dominance.
                        	    

                
                     AI Generated Content
                
    	    

             
				
        		

		    
		    		    
		    			

			    
Hello, I'm using the ADL5513 for a detector with low envelope bandwidth, around 0-100Hz. The ADL5513 datasheet only describes output noise density down to 1KHz. Do you have any data below 1KHz for estimating output noise? The plots show it decreasing at around 20dB/decade, but I'm assuming it must flatten out at some point...




Regards,


Mike

			

			
									
		                             
                        

    

                                            
                 adl5513
                
                                                    
                 RF Power Detectors
                
                                                    
                 Logarithmic Detectors
                
                                                    
                 rf and microwave
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



Parents
	
    
	

  • 
	
    



	
			
		
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 29, 2020 4:59 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi Mike,
    

    I was able to find some extended LF noise measurements to augment each of the two datasheet measurements, Fig. 15 and Fig. 18:
    

      
    

     
    

    -Bruce
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
				
				
				
		
		
    
			
		
    
	
    

    

    • 

	

  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
            
						
                            
            
            				
            
                on Jul 30, 2020 3:24 PM
            
            
												
						in reply to ADIApproved
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Wow. Flicker noise with a 40dB/decade slope? Hard to believe....
    

    For what it's worth, I'm measuring a standard deviation of 0.002dB with an envelope bandwidth of 100Hz, which corresponds to 42uV rms, or 4.2uVrms/sqrt(Hz) average over that band. Looking at the spectrum of my noise, it definitely has a 1/f noise look to it, but I don't think the slope is actually that sharp...
    

    Increasing my acquisition bandwidth to 1kHz doesn't significantly increase my rms noise, so I'm definitely dominated by low frequency noise.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

    • 

	




Reply

    


  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
            
						
                            
            
            				
            
                on Jul 30, 2020 3:24 PM
            
            
												
						in reply to ADIApproved
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Wow. Flicker noise with a 40dB/decade slope? Hard to believe....
    

    For what it's worth, I'm measuring a standard deviation of 0.002dB with an envelope bandwidth of 100Hz, which corresponds to 42uV rms, or 4.2uVrms/sqrt(Hz) average over that band. Looking at the spectrum of my noise, it definitely has a 1/f noise look to it, but I don't think the slope is actually that sharp...
    

    Increasing my acquisition bandwidth to 1kHz doesn't significantly increase my rms noise, so I'm definitely dominated by low frequency noise.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

    • 





Children
	
No Data


		
			








	






































     



















		        
        

            
Before You Switch

            
        

        

        

            Switching languages will make ADI Explorer unavailable. Resume your session by switching back to English and reopening ADI Explorer.