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   2차 Active 대역통과필터 : ft007.sch

   2차 Active Band Pass Filter 

                                        1                             1
                          f1 =  ---------           f2 = ---------
                                   2πR1C2                    2πR2C1
                                                         

                           BW = f2 - f1 = 10kHz - 1kHz = 9kHz
 
                           fo = √(f1f2) = 3.16kHz
 
   시뮬레이션 조건 : AC Sweep  -> Pts/Dec[101],Start Freq[10],End Freq[1mega] 
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