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LTC1060 Production
The LTC1060 consists of two high performance, switched capacitor filters. Each filter, together with 2 to 5 resistors, can produce various 2nd order filter...
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LTC1060 on Analog.com

LTC1067 Production
The LTC1067/LTC1067-50 consist of two identical rail-to-rail, high accuracy and very wide dynamic range 2nd order switched-capacitor building blocks. Each...
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LTC1067 on Analog.com

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Tunable notch Filters for audio frequency



		

			

									
					    krishnasln
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 7, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Dear Team,
    

    

    I have a requirement of tunable notch filter for which I tried two IC's LTC1060 & LTC1067. Below is my requirement description
    

    Requirement description: Tunable notch filter from 1KHz to 5KHz.

    

    Problem/Issue: Whistling noise in the audio frequency band 1KHz to 5KHz
    

    Solution required: To identify and eliminate the noise in the frequency band of 1KHz to 5KHz.
    

    To have a practical solution to identify the noise frequency, we planned to have LTC1060 or LTC1067 in which the notch frequency can be tuned using which we can identify the whistling noise frequency.
    

    So we have taken the circuits as mentioned in the datasheets and tried to simulate the same in LTSpice. The response is not as what is specified. 
    

    Please support to get the required tuning of notch frequency.
    

    

    Problem faced during simulation:
    

    

      

    1. LTC1060: The simulation did not show any notch in the graph.
      2. 

    2. LTC1067: I could get a notch but it is not at the frequency as specified in the datasheet which is 1.02KHz, but as per simulation I got it at 4.04KHz. Also as I change the clock frequency, there was no change in the notch frequency. But as per datasheet it is a clock tunable notch filter. Kindly explain
      3. 

    

    Please let me know where I have gone wrong in the circuit or simulation. Also if I need to modify the circuit to my requirements what are the changes which needs to be taken care off.
    

    

    The circuits which I have simulated are in the respective datasheets LTC1060 Pg-18 & LTC1067 Pg-20
    

    Awaiting your earnest response.
    

    Kindly do the needful at the earliest.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 clock tunable filter
                
                                                    
                 LTC1060
                
                                                    
                 filters
                
                                                    
                 Analog Functions
                
                                                    
                 LTC1067
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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