NJW1136 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJW1136 Datasheet PDF : 31 Pages
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NJW1136
! LPF Characteristics
R=24k
gm1
+
gm2
-
+
-
+
-
LF1
C1
Primary LPF
LF2
C2
Secondary LPF
LF3
C3
LPF Block Diagram
The NJW1136 includes the LPF for subwoofer output and bass boost function. The LPF consists of primary and
secondary LPF and it is enable to adjust “cut off frequency”, “Q” and “Roll off”.
The expression of LPF characteristics is as follows.
<Primary LPF>
f c1
=
2π
1
* R *C1
=
2π
1
* 24*103
*C1
<Secondary LPF>
fc2
=
42.9 ∗10−6
2π C2 ∗C3
Q2 =1.46*
C3
C2
Q1 = 0.5
<LPF Frequency Response>
C2 = 47nF, C3 = 22nF
5
C1=68nF
0
C1=33nF
-5 C1=22nF
C1=15nF
C1=47nF
-10
5
0
C2=47nF
C1 = 33nF, C
C
2
C2=33nF
-5
C2=68nF
C2=100nF
-10
-15
-15
-20
0.1
-20
1
Frequency [kHz]
0.1
1
Fr
C1 = 33nF, C2 = 47nF
5
C3=47nF
0
C3=22nF
-5 C3=15nF
C3=10nF
C3=33nF
-10
-15
-20
0.1
1
Frequency [kHz]
(12/12)
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