HA12167FB Datasheet, PDF (27/73 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck (Deck 1 Chip)

The Application of Equalizer Frequency Response
HA12167FB/HA12169FB
EQ
IN
EQ
VR
R1
GP
+
Gm 1
–
R4
+
OP 2
–
R5
F/Q
–
Gm 2
+
–
OP 5
+
C1
+
OP 6
–
+
Gm 3
–
C2
R6
R7
FM
+
Gm 4
–
C3
+
O_– P 7
GL
–
Gm 5
+
GH
–
Gm 6
+
+
OP 3
–
R9
R10
–
OP 4
+
EQ
OUT
R8
Figure 9 REC Equalizer Block Diagram
Transfer Function:
Vout
Vin
=

G_V



Gm5
⋅
R
8 ^{⋅ R}10
R9
⋅
1+
C3 _⋠Gm6
Gm4 Gm5
1+ ^C3 ⋅S
Gm4
⋅S
+ Gm1⋅ ^{R4 ⋅R10}
R6 ⁺ R7
⋅
1+
R4
R₅
⋅ ^R7
R₆ ⁺ R₇
C3 _⋅S
Gm4
⋅ ^C2 ⋅ S + ^R4
Gm3 R₅
⋅
C1 _â‹
Gm2
C2 _{⋅S 2}
Gm3




=
9
RREF




R_GL
⋅
1+ 6.67 × 10^{–10 RFM ⋅RGH}
R_GL
1+ 6.67 × 10 ^–10 R_FM⋅S
⋅S
+ _RGP ⋅
1+ 4.5
3.0 × 10^–10 ⋅R_FQ ⋅S
× 10 ^–11 ⋅_RFQ ⋅S + 2.5 × 10 ^–20
⋅_RFQ ⋅_RF/Q S²




Note: R_REF .... 14 pin bias resistance
G_V ...... Gain of EQ-VR
Rev.3, Jun. 1997, page 27 of 73