NJW1163A Просмотр технического описания (PDF) - Japan Radio Corporation
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NJW1163A Datasheet PDF : 24 Pages
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NJW1163/A
s LPF Characteristics
Secondary LPF
GmAmp2
Buffer2
GmAmp3
Buffer3
Primary LPF
R1
24k
LF2
LF3
LF1
C2
C3
C1
LPF Block Diagram
The NJW1163 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=15nF
0
C1=33nF
-5 C1=47nF
C1=68nF
C1=22nF
-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 -
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