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   Active 대역제거필터 : ft010.sch

   Active Band Trap Filter 

                                     1                          
                         fo = -------   ( R = R1 = R2,  R3 = R/2,  C = C1 = C2, C3 = 2C )
                                  2πRC                      

                            
                    대역리젝션필터(BRF), 대역트랩필터(BTF)혹은 노치(Notch)

                    필터라고도 한다.                 
                                                      

                   
 
   시뮬레이션 조건 : AC Sweep  -> Pts/Dec[101],Start Freq[10],End Freq[100k] 
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