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APPLIED ELECTRONIC CIRCUIT APPLIED ELECTRONIC CIRCUIT APPLIED ELECTRONIC CIRCUIT PassiveFilter 중요한특징: 증폭이없다. (Op-Amp 를가지고있지않음) -RC Filter 주로저역통과필터로사용된다. 저항R과커패시터C를신호원에직렬로연결하고C의양단에서출력을뽑는방법으로사용한다. -LC Filter 공진하는필터로특정주파수에서주파수선택적특성을가진다. 정확히공진하게되는주파수는1/d(LC)^(0.5)s Radian 으로나타낸다. 이것은특정한주파수를통과시키거나반대로막을수있기때문에필터로사용된다. APPLIED ELECTRONIC CIRCUIT PassiveFilter 중요한특징: 증폭이없다. (Op-Amp 를가지고있지않음) -RC Filter 주로저역통과필터로사용된다. 저항R과커패시터C를신호원에직렬로연결하고C의양단에서출력을뽑는방법으로사용한다. -LC Filter 공진하는필터로특정주파수에서주파수선택적특성을가진다. 정확히공진하게되는주파수는1/d(LC)^(0.5)s Radian 으로나타낸다. 이것은특정한주파수를통과시키거나반대로막을수있기때문에필터로사용된다. APPLIED ELECTRONIC CIRCUIT ActiveFilter 중요한특징: Op-Amp 를사용하고, 이득을구현할수있다. Low-pass Filter High-pass Filter -연산증폭기에대하여저항(R) 은직렬로, 커패시터(C) 는병렬로연결하여구성-가장간단한형태로구현되어모든필터의기본형으로쓰임-주어진차단주파수보다낮은주파수대역은통과시키고, 이보다높은주파수대역은감쇠시킴-저역필터의저항(R) 과커패시터(C)의위치를바꾸어구성한회로-LPF와정반대라서자주쓰일것같지만, 실제로는매우제한된용도로사용됨-주어진차단주파수보다높은주파수대역은통과시키고, 이보다낮은주파수대역은감쇠시킴APPLIED ELECTRONIC CIRCUIT ActiveFilter 중요한특징: Op-Amp 를사용하고, 이득을구현할수있다. Low-pass Filter High-pass Filter -연산증폭기에대하여저항(R) 은직렬로, 커패시터(C) 는병렬로연결하여구성-가장간단한형태로구현되어모든필터의기본형으로쓰임-주어진차단주파수보다낮은주파수대역은통과시키고, 이보다높은주파수대역은감쇠시킴-저역필터의저항(R) 과커패시터(C)의위치를바꾸어구성한회로-LPF와정반대라서자주쓰일것같지만, 실제로는매우제한된용도로사용됨-주어진차단주파수보다높은주파수대역은통과시키고, 이보다낮은주파수대역은감쇠시킴 APPLIED ELECTRONIC CIRCUIT * Ideal Filter Response Curves * Real Filter Response Curves APPLIED ELECTRONIC CIRCUIT * Ideal Filter Response Curves * Real Filter Response Curves APPLIED ELECTRONIC CIRCUIT * Capacitor * Inductor APPLIED ELECTRONIC CIRCUIT * Capacitor * Inductor APPLIED ELECTRONIC CIRCUIT RationalFunction Transfer Function Rational Function APPLIED ELECTRONIC CIRCUIT RationalFunction Transfer Function Rational Function Pole -Zero diagram Left Half Plane Right Half Plane APPLIED ELECTRONIC CIRCUIT APPLIED ELECTRONIC CIRCUIT APPLIED ELECTRONIC CIRCUIT First Order Active Filter 1. Low-pass Filter APPLIED ELECTRONIC CIRCUIT First Order Active Filter 1. Low-pass Filter Low-freq gain(DC gain) APPLIED ELECTRONIC CIRCUIT 2. High-pass Filter High-freq gain APPLIED ELECTRONIC CIRCUIT 2. High-pass Filter High-freq gain APPLIED ELECTRONIC CIRCUIT 3. Band-pass Filter Pass-band gain Low 3dB cutoff freq High 3dB cutoff freq APPLIED ELECTRONIC CIRCUIT 3. Band-pass Filter Pass-band gain Low 3dB cutoff freq High 3dB cutoff freq APPLIED ELECTRONIC CIRCUIT 4. Phase-shifter -0dB = 이득이‘1’(증폭에감쇄가없다!) 입력이출력에그대로나온다. -위상이주파수에비례(Time delay 가주파수별로같다!) Phase distortion 이안일어난다. APPLIED ELECTRONIC CIRCUIT 4. Phase-shifter -0dB = 이득이‘1’(증폭에감쇄가없다!) 입력이출력에그대로나온다. -위상이주파수에비례(Time delay 가주파수별로같다!) Phase distortion 이안일어난다. APPLIED ELECTRONIC CIRCUIT Second Order Active Filter APPLIED ELECTRONIC CIRCUIT Second Order Active Filter Undamped : Underdamped : Overdamped : Critically damped : APPLIED ELECTRONIC CIRCUIT APPLIED ELECTRONIC CIRCUIT Natural Response APPLIED ELECTRONIC CIRCUIT 1. Low-pass Filter LPF의DC gain( 상수) 주파수에따라변하는성분APPLIED ELECTRONIC CIRCUIT 1. Low-pass Filter LPF의DC gain( 상수) 주파수에따라변하는성분 APPLIED ELECTRONIC CIRCUIT 상수가된다.(DC일때일정한값에서시작) 필터로생각했을때, 2 차필터가더좋다! (특정주파수이상을더없애려고하기때문!) BUT Q 값에따라서over shoot OR under shoot 가발생한다!!!! 10배씩변할때마다40dB 씩줄어든다. APPLIED ELECTRONIC CIRCUIT 상수가된다.(DC일때일정한값에서시작) 필터로생각했을때, 2 차필터가더좋다! (특정주파수이상을더없애려고하기때문!) BUT Q 값에따라서over shoot OR under shoot 가발생한다!!!! 10배씩변할때마다40dB 씩줄어든다.