9 2010103821 생체의공학과 최준민 제출일 20140526 월 Filter Passive Filter 이득이 없는 필터 Active Filter 이득이 있는 필터 LPF LPF HPF HPF Ideal Filter ID: 801058
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Slide1
응용전자회로 강의록#9
2010103821
생체의공학과
최준민
제출일
2014.05.26(
월
)
Slide2Filter
Passive Filter :
이득이 없는 필터
Active Filter : 이득이 있는 필터
LPF
LPF
HPF
HPF
Slide3Ideal Filter
1)LPF
2)HPF
3)BPF
4)Notch
lHl
lHl
lHl
lHl
Slide4Real Filter
예
) LPF
1)LPF
lHl
Pass
band
Stop
band
Transition
band
Slide5Filter
1)
저항
:2)커패시터 :3)
인덕터 :
H
Vi(t)
Vo(t)
Slide6Filter
LHP
(Left Half Place)
RHP
(Right Half Place)
축상이
아닌 곳의
zero
나
pole
은 항상 켤레 복소수를 가진다
.
*Pole –Zero Diagram
이
축상에
나타나는 값들은
모두 실근 혹은 중근으로 표현
된다
Slide7Filter
σ
k
>0
σ
k
<0
Slide8Filter
BiBo
Stability
: Bounded Input Bounded Output->
σk<0
σ
k
>0
σ
k
<0
σ
k
=0
Slide9Filter
σ
k
<0 : 모든 Pole이 LHP 내부에 있다
.Natural Response “die out” -> Transient Response앞으로 Steady State Frequency Response
만 본다.
H(jw
)
Vi(t)
Vo(t)
Vi(
jw
)
Vo(
jw
)
Slide10Filter
예
) LPF
Vi(t)
Vo(t)
R
2
Slide11Filter
Slide12First Order Active Filter
Vi(t)
Vo(t)
R
2
1.LPF
Slide13First Order Active Filter
Vi(t)
Vo(t)
2.HPF
R
2
Slide14First Order Active Filter
Vi(t)
Vo(t)
3.BPF
Slide15First Order Active Filter
Vi(t)
Vo(t)
4.Phase Shifter
Vp
(t)
입력에
대한 증폭은 없고
그대로 나옴
>>all pass filter
Slide16First Order Active Filter
주파수↑ → 위상이 비례해서 증가
Time delay
같다
→
Phase distortion X
Slide17Second order Active Filter
①
ζ
>1 (
서로 다른 실근
)
2개의
Pole in LHPNatural response는 2
개의 지수함수의 합
Slide18Second order Active Filter
② 0<
ζ
<1 (켤레복소수)2개의
Pole in LHPNatural response : damped sinusoid
③
ζ
=0 (
undamped
)
Natural response
Slide19Second order Active Filter
④
ζ
<0 (undamped)Diverge 발산
(unstable)
damping↑→ zeta
가
1
에가까워진다
→ Q가 작아진다→ osillation 수↓
damping↓→ zeta
가
0
에가까워진다
→ Q
가 커진다
→
osillation
수
↑
Slide20Second order Active Filter
A)LPF
Q
값↑