
HA12167FB/HA12169FB
28
The Application of Equalizer Frequency Response
R1
EQ
IN
EQ
VR
GP
Gm 1
+
–
+
–
OP 2
+
–
OP 6
+
–
Gm 2
F/Q
C1
C2
–
+
OP 5
R6
+
–
Gm 3
GL
FM
+
–
Gm 4
C3
R9
R10
EQ
OUT
R8
GH
+
–
OP 7
–
+
Gm 5
+
–
OP 3
R5
R4
R7
–
+
Gm 6
–
+
OP 4
Figure 9 REC Equalizer Block Diagram
Transfer Function:
Vout
Vin
G
Gm5
R R
R
1+
C3
Gm4
Gm6
Gm5
S
1+
C3
Gm4
S
Gm1
R R
R
R
C3
Gm4
S
1+
R
R
R
R
R
C2
Gm3
S +
R
R
C1
Gm2
C2
Gm3
S
1 6.67 10
R
R
R
V
8
10
9
4
10
6
7
4
5
7
6
7
4
5
2
–10
FM
GH
GL
=
⋅
⋅
⋅
⋅
⋅
⋅
+
⋅
⋅
+
⋅
⋅
⋅
+
⋅
⋅
⋅
⋅
⋅
×
⋅
⋅⋅
×
⋅
+
⋅
×
⋅
⋅
+
×
⋅
⋅
×
⋅
⋅
S
1 6.67 10
R
S
R
3.0 10
R
S
1 4.5 10
R
S + 2.5 10
R
R
S
–10
FM
GP
–10
FQ
–11
FQ
–20
FQ
F/Q
2
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