Products Mentioned

ADMV8526 Recommended for New Designs
The ADMV8526 is an RF band-pass filter that features a digitally selectable frequency of operation. The filter center frequency (fCENTER) can be adjusted...
Datasheet
ADMV8526 on Analog.com

ADMV8505 Recommended for New Designs
The ADMV85051 is an RF band-pass filter that features a digitally selectable frequency of operation. The filter center frequency (fCENTER) can be adjusted...
Datasheet
ADMV8505 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 1 reply
  • Subscribers 70 subscribers
  • Views 380 views
  • Users 0 members are here 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
ADMV85xx Bandpass Filter Output Characteristics

		
	
				

			

									
					    ElectronManager
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Aug 28, 2025 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquires about the ADMV85xx bandpass filters, specifically if they can be considered unamplified switched-capacitor filters, if they modulate or shift the input signal frequency, if they produce output artifacts, and why residual phase noise at a 1 MHz offset from Fcenter is only specified for the ADMV8526. The final answer confirms that the ADMV85xx devices are unamplified switched-capacitor filters, do not modulate or shift the input signal frequency, and can exhibit compression and intermodulation distortion. Residual phase noise plots for ADMV8913 and ADMV8818 are similar to ADMV8526, suggesting comparable performance across the series.
                        	    

                
                     AI Generated Content
                
    	    

             
				
        		

		    
		    		    

		      		            		        
Category: Datasheet/Specs

    		        		            		    
Product Number:  ADMV8526  

    		        		    		    

		    		    
		    			

			    
I have some questions about the ADMV85xx bandpass filters.


Can the ADMV85xx devices be thought of as unamplified switched-capacitor filters?


Is the frequency of the input signal modulated or frequency shifted at all by the bandpass filtering process in the ADMV85xx devices?


Does the ADMV85xx filtering process produce any artifacts in the output?


The ADMV8526 datasheets specify the Residual Phase Noise at a 1MHz offset from the center tuning frequency, Fcenter, and show a plot as well. The other similar filters in this ADMV85xx series don't show this information.


Is there some reason these other filters are different? Or do all of the devices meet their typical insertion loss at a 1 MHz offset from Fcenter?

			

			
									
		                             
                        

    

                                            
                 Bandpass Filter
                
                                                    
                 Datasheet/Specs
                
                                                    
                 ADMV8513
                
                                                    
                 Residual phase noise
                
                                                    
                 ADMV85xx
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
                    Show More
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

  • 
	
    



	
			
		
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Aug 29, 2025 9:28 AM
            
            
						
			            		
    
		
										+1
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    To answer your questions:
    Q1. Can the ADMV85xx devices be thought of as unamplified switched-capacitor filters?
    A1. Yes
     
    Q2. Is the frequency of the input signal modulated or frequency shifted at all by the bandpass filtering process in the ADMV85xx devices?
    A2. No
     
    Q3. Does the ADMV85xx filtering process produce any artifacts in the output?
    A3. While the filtering mechanism is passive, the part exhibits compression and intermodulation distortion. 
     
    Q4. The ADMV8526 datasheets specify the Residual Phase Noise at a 1MHz offset from the center tuning frequency, Fcenter, and show a plot as well. The other similar filters in this ADMV85xx series don't show this information.
    Is there some reason these other filters are different? Or do all of the devices meet their typical insertion loss at a 1 MHz offset from Fcenter?
    A4. I'm not sure why some datasheets include it and some do not.  I looked through some other datasheets and did find residual phase noise plots for ADMV8913 and ADMV8818. Both show similar performance to ADMV8526. So I think that you can use these plots as guidance for the family. 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
				
				
				
		
		
    
			
		
    
	
    

    

    •