Zpodł
Zpodł
Zpodł
Zpoprz
Zpoprz
Zpoprz
Tłumienność
U
I
a = ln 1 = ln 1
U
I
2
2
[ a] = 1 N = 8,686 dB → 1 dB = , 0 115 N
U
I
a
1
1
(
)
20log
20log
dB =
=
U
I
2
2
F i l t r d o l n o p r z e p u s t o w y L
L
2
2
L
C
C
C
2
2
ω
2
0 =
LC
R
u
u
1( t)
C
2( t)
U ( s) 1
1
1
U ( s
1
) =
=
U ( s) =
U ( s
2
)
sC
sRC
1
+ 1
s
1
1
τ +1
R + sC
1
U ( s) =
U ( s) ⇔ s 2
>> 1
s
1
τ
τ
1
1
U ( jω ) =
U ( jω ) =
U ( jω ) 2
jω RC +1 1
jωτ +1 1
−1+ jωτ
−1+ jωτ
=
(
=
jωτ + )
U
jω
U
jω
1 (− jωτ + ) (
)
(
)
1 1
2
ω τ +1 1
2
U ω
1
( ) =
U ω
( )
2
ω τ
1
2 2 +1
gdzi e ω = 1 RC =1 τ
0
| k | , a 1
a
| k |
0 , 7 0 7
a
0 , 2 9 3
0
ω
ω
0
F i l t r g ó r n o p r z e p u s t o w y C
2
C
2
C
L
2 L
2 L
ω
1
0 = 2
LC
C
u
u
1( t)
R
2( t)
U ( s
1 )
sRC
sτ
U ( s) =
R =
U ( s) =
U ( s
2
)
sRC
1
+
s
1
1
1
τ +1
R + sC
U ( s) = sτ U ( s) ⇔ sτ < 1
2
1
j
j
2 2
U ( jω
ωτ
) =
U ( j ) =
+
U ( jω
2
)
j
1
ωτ
ω
ωτ ω τ
+
2 2
1
1
ω τ +1
ωτ
U ω
( ) =
U ω
( )
2
ω τ
1
2 2 +1
gdzi e ω = 1 RC =1 τ
0
| k | , a 1
a
0 , 7 0 7
| k |
a
0 , 2 9 3
0
ω
ω
0
F i l t r p a s m o w y L
C
C
1
1
1
L 1
L
C
2
1
ω = ω ω
0
1 2
| k | , a
| k |
1
a
0 , 7 0 7
0
ω
ω
ω
ω
1
0
2