1                             1              1        1
                          BW =  --------           fo² =  --------  ( ---  +  ---  )
                                     2πR1C                      8π²R1C²      R1       R2

                            
                                       ( R3 = 2 × R1     ,   C = C1 = C2 )    
                                                      

                   대역폭(B)에는 영향을 주지않고 중심주파수(fo)만을 조정할 수 있는 장점